Revert "Delete mailer queue"
Created by: maxlazio
Reverts gitlabhq/gitlabhq#7252
Mailer queue is being used to send all devise related emails so it is necessary to have it.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: maxlazio
Reverts gitlabhq/gitlabhq#7252
Mailer queue is being used to send all devise related emails so it is necessary to have it.