Block sqlalchemy-migrate 0.9.2

Breaks unit tests.

Conflicts:
	requirements.txt

Closes-Bug: #1368391
Change-Id: Ic814a91038800201603baf33ca40e4586944343b
(cherry picked from commit eb01ccba28b0feabe6220c125776fee3c2c52505)
Merge "Block sqlalchemy-migrate 0.9.2" into stable/icehouse