cephadm: update how smb configwatch sidecar is started

In order to update users (and groups) live without AD support we need
the configwatch sidecar to be configured for split (altfiles) nsswitch.
The capability to configure configwatch for nsswitch was added to
sambacc under a special mode of the run subcommand.
Switch to starting the confgwatch sidecar using the run subcommand and
configuring the appropriate user and nsswitch setup options.

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