Block sqlalchemy-migrate 0.9.2

Breaks unit tests.

Closes-Bug: #1368391
(cherry picked from commit a8e54eccbb11ccdff2ac336514e669bc9218b5c9)

Change-Id: I347a20fd35ae20f1de5db7f2608090b08af6c0ff
Merge remote-tracking branch 'upstream/stable/icehouse' into stable/icehouse