cephadm: add support for a remote control local socket

cephadm: add support for a remote control local socket

It's not an oxymoron, it's Remote Control Local Socket (tm)!
This allows processes on the ceph host to use a unix domain socket
without mTLS to communicate with the remote control sidecar server
in the samba service.

At the higher level We treat the 2nd listener as a "feature" even
though it really configures the same sidecar as "remote-contol".
This way it's easy to have one of "remote-control",
"remote-control-local" or both in the service spec configuring the
smb service.

NOTE: This service does have the ability to verify that the client has
admin-ish access to ceph services by needing the client to pass
the ceph user name and key over the grpc headers.

Signed-off-by: John Mulligan <jmulligan@redhat.com>