Fixes for 7.5.2

See merge request !1283

Make the diff with 7.5.1 smaller.

ProjectWiki.new() creates a new wiki git repository, so any tries
to bare clone a bundle fail. With this patch we remove the newly
created wiki.git before restoring from the backup bundle.

Conflicts:
	lib/backup/repository.rb

Conflicts:
	config/initializers/4_sidekiq.rb

Update changelog

See merge request !1258

Run 'GC.start' after every EmailsOnPushWorker job

This change removed a lot of large peaks of the Sidekiq memory growth graph on gitlab.com.

See merge request !1257

Update gitlab_git to 7.0.0.rc11

See merge request !1256

Gitlab.com uses special packages, build them first

See merge request !1255

Author attributes clean

See merge request !1254

Strip tags from branch name

See merge request !1251

Update changelog

See merge request !1252

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix for #8271: Correctly restore empty repositories.

If a project is being restored, but there is no bundle file, the project was
empty when it was backed up.  In this case, just use git init --base to create a
new bare repository.

Actions in the inbox

Related to #1607

See merge request !1247

RAM Requirements update

512MB of RAM is not enough to install using omnibus-gitlab.

Installation will fail in very random places.

Manual installation might also fail with this low amount of RAM.

See merge request !1249

Performance improvements

Push 1k commits cause 1k sql queries to collect commit author. But this variable was used only in 20 commits (from 1000).
So we did 980 sql queries without using it. This MR fixes it.

See merge request !1250

fixes the `block_removed_ldap_users` rake task

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Custom git hook documentation

Merge branch 'commit-comments' of https://gitlab.com/jeroenj/gitlab-ce into jeroenj/gitlab-ce-commit-comments
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CHANGELOG

Drop all Postgres sequences during backup restore

See merge request !1226

Conflicts:
	CHANGELOG