add missing incoming_email_idle_timeout setting
Add missing incoming_email_idle_timeout
setting. Replaces part of https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1303.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add missing incoming_email_idle_timeout
setting. Replaces part of https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1303.