cephadm/smb: add support for remote control sidecar

cephadm/smb: add support for remote control sidecar

Add support for the remote control sidecar. The remote control server
is provided by the sambacc project. It is a small grpc server that
allows remote systems to get live information about connected clients
and disconnect clients or shares from the servers. The gRPC server
requires being run in mTLS mode to make changes.

Adding sidecar required adding a bunch of support for TLS/SSL certificate
management. I copied some of what other ceph containers do, like map
in a dedicated dir having certs. I expect some more stuff in the smb
daemon will require TLS support so I tried to make it a little more
generic than would be strictly needed by just this sidecar.

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