create.py: use rcceph instead of service on SUSE

Attempting to start a monitor node with the command:
	/sbin/service ceph -c /etc/ceph/X.conf start mon.Y
currently fails on SUSE based systems.

The failure is caused by the service binary's attempt to parse the
-c argument as its own.
Call the ceph init script directly instead to avoid this.

Signed-off-by: David Disseldorp <ddiss@suse.de>