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.  Needed to converge
in the register tests, so Chef loads the provider and creates
the classes.  The db spec was previously doing that, which allowed
tests to pass.

Change-Id: I301b7fc625790960efd99d08395b91204ae18107
Merge "Removed the db recipe"