Create stronger affinity between drivegroup specs and osd daemons
We currently only show the name of the drivegroup spec in `orch ls`
#ceph orch ls NAME RUNNING REFRESHED AGE PLACEMENT IMAGE NAME IMAGE ID osd.test_dg 0/1 - - cephadm-dev <unknown> <unknown>
which isn't able to correctly display the associated osds.
ServiceDescription to track the "service" -> osd.drivegroup_name
DaemonDescription to track the "daemons" -> osd.0
This also allows to track osd if more than one drivegroup per node is applied.