rhel/ovsdb-server.service: Rename the nonetwork service

rhel/ovsdb-server.service: Rename the nonetwork service

Currently, openvswitch.service calls out to start
openvswitch-nonetwork.service.  However, openvswitch-nonetwork.service
will be called ovsdb-server, so that it is a bit more reflective of
the dependencies.  This commit does make the file a bit of a misnomer as
currently the ovsdb-server SERVICE will start the ovs-vswitchd service
as well.  A future commit will clean this up, and change the ifup
configuration in the process.

Signed-off-by: Aaron Conole <aconole@redhat.com>
Acked-by: Markos Chandras <mchandras@suse.de>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Russell Bryant <russell@ovn.org>