Updated openstack/openstack
Project: openstack/heat  e3688f5f1a808412fa9f1efe72d23adc9ecb2b24
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Use oslo db.migration script

Turn Heat's migration script into a simple wrapper around olso's.
The api is a bit different so for now keep ours inplace.
All that our script does is find the path to the migration_repo
and call the oslo code. No point having two implementations in the
same codebase.

Change-Id: I0aa3e10890f924d77268f4118dae53b446e193eb