Add alembic migration tool to sqlalchemy

Implements blueprint alembic-migrations-db

Change-Id: I45202122ab9c8660a152b843a6ad675f6c22bce1

test-requirements.txt

@@ -1,16 +1,20 @@
 hacking>=0.8.0,<0.9
 
+MySQL-python
 coverage>=3.6
 discover
 docutils==0.9.1
 fixtures>=0.3.14
 mock>=1.0
 oslo.sphinx
+psycopg2
 pylint==0.25.2
 sphinx>=1.1.2,<1.2
 sphinxcontrib-httpdomain
-testtools>=0.9.32
+sqlalchemy-migrate>=0.8.2
 testrepository>=0.0.17
+testscenarios>=0.4
+testtools>=0.9.32
 unittest2
 
 python-savannaclient>=0.4.0