Make inbox default IMAP mailbox
Customer was having an issue where the IMAP server was failing due to missing mailbox NIL. This forces the value in gitlab.yml to be set to a reasonable default.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Customer was having an issue where the IMAP server was failing due to missing mailbox NIL. This forces the value in gitlab.yml to be set to a reasonable default.