Include the Sidekiq version in gitlab:env:info
Use the new Sidekiq syntax to specify queues

This syntax is compatible with the current Sidekiq version we use
(2.17.0) and it protects us against future breakage by
https://github.com/mperham/sidekiq/commit/040eda558bc64139c846c781d3de0b79603e3035
fix JIRA documentation by explaining how to reference JIRA issues in GitLab comments
 Merge branch 'sidekiq_version_in_env_info' into 'master'

Show Sidekiq version in gitlab:env:info
 Merge branch 'jira_issue_reference' into 'master'

Explain how to refer to JIRA issues
Add a failing test.
Add or remove watchers from list based on their notification settings.
Use group notification settings while honoring project settings.
Add comments, fix style, better names for notification methods.
 Merge branch 'new_sidekiq_cli_syntax' into 'master'

New Sidekiq CLI syntax
Pin sidekiq version to 2.17.0.
 Merge branch 'honor_notification_level' into 'master'

Honor notification levels

Fixes #1093
 Merge branch 'pin_sidekiq_version' into 'master'

Pin gem sidekiq version