FBR: MBS upgrade

[Ralph Bean]

Hi,

I'd like to upgrade the MBS to:
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-1db0646bc6

In particular, the bit about "Wait for components to be tagged also in
final tag before marking module as done. This should fix an issue for
the F27 compose." is important. See
https://pagure.io/fm-orchestrator/pull-request/686

There is a db upgrade (to the MBS db) in this update.  I'll verify in
staging first that I can upgrade/downgrade before touching prod.

Anyone for a +1?

-Ralph