Upgrade to Ruby 2.4.4 (EE port)

See merge request gitlab-org/gitlab-ee!5783

* A change in Ruby (https://github.com/ruby/ruby/commit/ce635262f53b760284d56bb1027baebaaec175d1)
requires passing in the exact required length for OpenSSL keys and IVs.

* Ensure the secrets.yml is generated before any prepended modules are
loaded. This is done by renaming the `secret_token.rb` initializer to
`01_secret_token.rb`, which is a bit ugly but involves the least impact on
other files.

* Reading an invalid OpenSSL::PKey causes OpenSSL to throw OpenSSL::PKey::PKeyError
instead of ArgumentError (https://github.com/ruby/openssl/blob/master/History.md).

Part of "Extract EE specific files/lines for app/views/shared/issuable"

See merge request gitlab-org/gitlab-ee!5823

EE: Improve runner_type validations for Ci::Runner

See merge request gitlab-org/gitlab-ee!5672

EE: Resolve "A lot of constants redefinition warnings"

See merge request gitlab-org/gitlab-ee!5927

Add validation to webhook and service URLs to ensure they are not blocked because of SSRF

See merge request gitlab-org/gitlab-ee!5851

Truncate Geo event log with a delay

Closes #6221

See merge request gitlab-org/gitlab-ee!5897

Resolve "Strike through the whole line when vulnerability is dismissed"

Closes #6005

See merge request gitlab-org/gitlab-ee!5929

Docs: fix typo

See merge request gitlab-org/gitlab-ee!5931

Refactor LDAP docs

See merge request gitlab-org/gitlab-ee!3691

CE upstream - 2018-05-31 21:32 UTC

See merge request gitlab-org/gitlab-ee!5925

EE port of ide-jobs-list-components

See merge request gitlab-org/gitlab-ee!5904

Remove assign merge requests ability from reporter role

Closes gitlab-ce#44728

See merge request gitlab-org/gitlab-ee!5922

EE Port: Use NPM provided version of SortableJS

See merge request gitlab-org/gitlab-ee!5923

Which could extend from EE

* Replace `require` or `require_relative` with `require_dependency`
* Remove unneeded `autoload`

# Conflicts:
#	app/controllers/profiles_controller.rb
#	app/controllers/projects/issues_controller.rb
#	app/views/projects/issues/_nav_btns.html.haml
#	app/views/shared/issuable/form/_merge_params.html.haml
#	config/routes/project.rb
#	db/schema.rb
#	locale/gitlab.pot
#	spec/controllers/application_controller_spec.rb

[ci skip]

Update 404 and 403 pages

Closes #25955

See merge request gitlab-org/gitlab-ce!19096

Fix bootstrap squash checkbox alignment

Closes #47055

See merge request gitlab-org/gitlab-ce!19292

Fix bootstrap pipeline right alignment

Closes #46875

See merge request gitlab-org/gitlab-ce!19284