ceph: stop adding repos
ceph: stop adding repos

The ceph-ansible playbooks already take care of setting up
the keys and installing the repositories.  It also do it
in a more cleaner, overridable way, so let's let it do
it's own thing[0].

[0]: https://github.com/ceph/ceph-ansible/tree/739a662c8084a80cf5565640556389d2b59c7daa/roles/ceph-common/tasks/installs

Change-Id: I597a2532f370faeeae301eb557fc71d2326d58a2

openstack/openstack-ansible,stackforge/os-ansible-deployment,stackforge/os-ansible-deployment,openstack/openstack-ansible