[WIP] Update packer docs related to Atlas

Add interpolation for .BuildName in compress output filename

Fix govet issues

Added go vet and git rev-parse head to appveyor so we can see what we're actually building / testing

Fix 'ephemeral' misspelling.

Add missing option

Add 1/10th second delay between key events to VNC for QEMU

Use go vet instead of go tool vet, and actually run it with make

Rename .html.md files to .html.markdown

Fixes #2546.  Make files under website/source/docs/provisioners conform to
standards for rest of docs.

Update code.google.com/gosshold/ssh to point to golang.org/x/crypto/ssh, since this has been moved into core now

amazon builder: only fetch password for winrm

Fix case for ethernet.generatedAddress property lookup in VMX

Fix last example syntax

Update code.google.com/gosshold/ssh to point to golang.org/x/crypto/ssh, since this has been moved into core now

Fixes #2515

Add options to specify salt remote dirs

Ensure that `/etc/salt` exists

Merge branch 'openstack_metadata' of https://github.com/trumant/packer into trumant-openstack_metadata