Removed the db recipe

The db recipe have been removed.  It is up to the operator to
setup the database, users, and grants before deploying openstack.
It has been moved to the `openstack-db` recipe in the
`openstack-ops-database` wrapper cookbook.

Change-Id: I15bac0058aa0021713a95c458f70eeeac80b4760
Merge "Removed the db recipe"