Lazily set UUID in ApplicationSetting for new installations

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/2246

/cc @stanhu

assigned to @dbalexandre

resolved all discussions

added 162 commits

• 1dec19d7...8e91aa9b - 159 commits from branch master
• d5fce779 - Lazily sets UUID in ApplicationSetting for new installations
• fa586441 - Add CHANGELOG
• 387fd0cb - Fill missing uuid on the application_settings table

Compare with previous version

@rymai Thanks for the feedback! Can you have another look?

assigned to @rymai

added 9 commits

• 387fd0cb...e2be17b7 - 6 commits from branch master
• d464d790 - Lazily sets UUID in ApplicationSetting for new installations
• 2b4361a6 - Add CHANGELOG
• 8c9e3168 - Fill missing uuid on the application_settings table

Compare with previous version

Port to EE https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1733

Thanks, looks good to me!

approved this merge request

assigned to @smcgivern

merged

mentioned in commit 4d3bd41d

Picked into 9-1-stable, will go into 9.1.2

mentioned in commit 07b4c1b2

mentioned in issue #30864 (closed)

mentioned in merge request gitlab-com/www-gitlab-com!5843 (merged)