docker: we don't need to copy the ceph.conf on all the nodes

docker: we don't need to copy the ceph.conf on all the nodes

We generate the ceph.conf on all the nodes through the
ceph-docker-common so there is no need to push it to the Ansible file.

Also this is breaking the ceph.conf template generation since we only
generate sections based on the host the ansible task is running on.

For example, what's typically happening, we bootstrap the monitor, we
get a ceph.conf generated for a mon only, we go on an osd, we generate
the ceph.conf with osd section (done by ceph-docker-common) but this
gets overwritten by the copy_config task of the ceph-osd role.

Signed-off-by: Sébastien Han <seb@redhat.com>