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
Ability to ignore db migrations

There are cases where migrations should not be executed.  For example when
upgrading a zone, and the image database is replicated across many zones.
Having the ability to toggle migration execution is useful (and a use-case
we have :))

Change-Id: I0af8f9ce16814b89b72bebfc868f84e48626e101
Added the new rabbit `["openstack"]["mq"]` attributes

After reading over the configuration, rabbit host was being
injected into the templates, however, the `notifier_strategy`
is set to `noop`.  Since mq is not configured in glance,
set the `rabbit_host` flag to the template's default value.
When someone is ready to come along and configure glance w/
rabbit, the attributes are setup properly.

Change-Id: I52f3c2b54e3313c48df0f2f0edbdeba72a526171
Merge "Removed the db recipe"