Update oslo db

This is to get the schema check that was added.

Note:
- updated to commit: 8dee4b6f04523d71d2011243875865ebb1508eb6
- but this excludes the following commit:
https://github.com/openstack/oslo-incubator/commit/6603e8fe90da226af579b27ee364aa4bd89d57da

Change-Id: Ia8e2faaac53f41ab12b51334a8564f7eed72f8e4
Merge "Update oslo db"