Allow searching by namespace name, include public projects

GITLAB-1457 (GITLAB-836)

Change-Id: If8e2474bc6908accca51f395f58937687f101b58
Add 6.0-to-6.2 update guide
Escape strings

Signed-off-by: Nigel Kukard <nkukard@lbsd.net>
Include a note if there are security fixes.
Best to escape strings not split them

Signed-off-by: Nigel Kukard <nkukard@lbsd.net>
Update gitlab_git to recent version
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Shell escape code search
Merge pull request #5475 from nkukard/esc-strings

Escape strings
Correctly escape search query
Require gitlab-shell v1.7.3
Merge pull request #5435 from karlhungus/feature_search_namespace_name_and_public

Allow searching by namespace name, include public projects
Mention security improvements in CHAGENLOG for 6.3
Mention GitLab CI 4.0 in CHANGELOG

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Show only first line of commit message on dashboard

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Fix sidekiq start text in documentation and gitlab:check
Merge pull request #5487 from perryfaro/fix-sidekiq-documentation

Change documentation about sidekiq
Merge branch 'security-upgrade' of /home/git/repositories/gitlab/gitlabhq
Bump gitlab-shell to 1.7.3
Merge branch '6_0_to_6_2' of /home/git/repositories/gitlab/gitlabhq