Allow searching by namespace name, include public projects

GITLAB-1457 (GITLAB-836)

Change-Id: If8e2474bc6908accca51f395f58937687f101b58
Add 6.0-to-6.2 update guide
Include a note if there are security fixes.
Correctly escape search query
Merge branch 'release/undev_v3.2.0' into develop

* release/undev_v3.2.0: (352 commits)
  Fix redirect while project removed by user
  Correctly escape search query
  fix errrs
  Diff selected symbols styles added at body. (refs #29667)
  Update redirects refs #26727
  Fixes refs #33074
  Fix projects
  Fix selectboxes
  Shell escape code search
  Update gitlab_git to recent version
  Best to escape strings not split them
  Fix group list test
  Search in code
  Improve last activity representation on dashboard
  Improve dashboards right block
  Fix group menu
  Fix groups dangerous options
  Fixes
  We do not support mysql
  Travis setup
  ...
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>
First step create builds for jenkins
save
Fix sidekiq start text in documentation and gitlab:check
Merge pull request #5487 from perryfaro/fix-sidekiq-documentation

Change documentation about sidekiq
Add build worker
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
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Show watch button only if user legged in gitlab