[director] fix spec_helper DB migrations
Add retry when instance updater updates DNS record info in database due to race condition in parallel updates
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Add retry when instance updater updates DNS record info in database due to race condition in parallel updates
  [director] fix spec_helper DB migrations
Merge branch 'master' into platform

* master:
  Add retry when instance updater updates DNS record info in database due to race condition in parallel updates
  [director] fix spec_helper DB migrations