Use default btn styling for Housekeeping button on projects settings page

Changes the Housekeeping button styling on the project settings page from ```btn-save``` to ```btn-default```

**BEFORE:** ![Screen_Shot_2016-12-06_at_12_51_42_PM](/uploads/1b1c8a26eead025062e2c98d9d0f4286/Screen_Shot_2016-12-06_at_12_51_42_PM.png)

**AFTER:** ![Screen_Shot_2016-12-06_at_12_51_57_PM](/uploads/9e7937af4a058fa1aa8b45653dbad3ee/Screen_Shot_2016-12-06_at_12_51_57_PM.png)

Closes #25324 
cc: @awhildy

See merge request !7959

fix display hook error message

## What does this MR do?

Fix hook error message display.  

## Are there points in the code the reviewer needs to double check?

Probably Hook will return the plain multi line text.  It is better `pre` tag than `h4`.  
I thought of another good looking display, but I did not come up with it. 😓 

## Why was this MR needed?

When the hook returns an STDERR, "Merge in progress" button spinning forever. Due to javascript's error.  

## Screenshots (if relevant)

When update hook returns an error like

```
XXXXXXXX

YYYYYYYY
ZZZZZZZZ
```

![screen_shot](/uploads/8dac77972a309dfcb72c741dffbd7270/screen_shot.png)

## What are the relevant issue numbers?

Closes #24020

See merge request !7775

Stop replacing `$your_email` with the user's email in the `/help` pages

See merge request !8014

Remove 'Leave Project' and 'Leave Group' from settings dropdowns

## What does this MR do?

Removes `Leave Project` and `Leave Group` from the settings dropdown.

Adds it to the `views/shared/members/access_request_buttons.html.haml`.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-11-19_at_15.34.26](/uploads/5c66a025513b4780a9e881f0036381e4/Screen_Shot_2016-11-19_at_15.34.26.png)
![Screen_Shot_2016-11-19_at_15.35.29](/uploads/ed74a5dfe982cf65bb49c0c4fb307061/Screen_Shot_2016-11-19_at_15.35.29.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #23305

See merge request !7600

Use gitlab-workhose 1.1.1

Change CI API rate limiting behavior.

Will make a separate MR for 8-14-stable because that version lacks the workhorse install rake task.

See merge request !7990

Updates the font weight of button styles because of the change to system fonts

## What does this MR do?

Updates the font weight of button styles because of the change to system fonts

## Are there points in the code the reviewer needs to double check?
-

## Why was this MR needed?

Because of the change to system fonts the font weight for buttons needed to be toned down a bit.

Seems only buttons styles were affected.

## Screenshots (if relevant)

left = result

![image](/uploads/c75868dca76561cafd559fb721be0601/image.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


cc: @cperessini

See merge request !8012

Updated members dropdowns

## What does this MR do?

EE has different dropdowns to allow for group LDAP members to be overridden, this ports the dropdown changes over to reduce conflicts.

## Screenshots (if relevant)

![Screen_Shot_2016-12-07_at_15.28.20](/uploads/6cb6def34015b024dc878aa3b99be4a0/Screen_Shot_2016-12-07_at_15.28.20.png)

See merge request !7974

Use a single query in Projects::ProjectMembersController to fetch members

See merge request !7997

Update "Installation from source" guide for 8.15.0

Following the steps from https://gitlab.com/gitlab-org/release-tools/blob/master/doc/release-candidates.md#creating-rc1.

See merge request !8015

Resolve "Provide SVG as a prop instead of hiding and copy them in environments table"

## What does this MR do?
- Provides SVG as a prop instead of manually manipulate the DOM to show it 
- Uniforms all props names in environments related components, 3 formats were being used and it was error prone
- Adds tests for the new SVG props.

## Why was this MR needed?
Technical debt.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #25374

See merge request !7992

The `$your_email` was removed from the SSH doc.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Displays milestone remaining days only when it's present

See merge request !7998

Do not reload diff for merge request made from fork when target branch in fork is updated

Closes #25263

See merge request !7973

API: Ability to remove source branch

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/23577

See merge request !7804

Fix comments tab disappearing

Fixes #25272

See merge request !7913

Render SVG images in notes

Closes #24937 

See merge request !7747

Update JIRA troubleshoot documentation

closes #25152

See merge request !7977

Improvements to setting up SSH documentation

## What does this MR do?

Improves the documentation article on setting up SSH. 

* Added introduction
* Added additional explanations
* Added sub headings
* Moved sections around
* Added section about generating an SSH key pair on Windows with PuttyGen (will be expanded further in future)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/24708

See merge request !6571

[ci skip]

The target branch of a merge request has to be a branch in the project
for which the merge request is submitted. When a branch changes in a fork,
it does not make sense to reload diffs of merge requests in the upstream
project that use the same branch name as the target branch.
Please note that it does make sense to reload diffs when the source branch
changes.

Update docs to reflect new defaults on omnibus

## What does this MR do?

Updates docs, after gitlab-org/omnibus-gitlab!1154 the flow has changed.

See merge request !8006