mgr/cephadm: stop conflicting daemon when deploying to a specific port

mgr/cephadm: stop conflicting daemon when deploying to a specific port

If we are deploying a daemon to bind to a specific port and there is
an existing daemon we are removing that also binds to that port, stop
it first.  Unless we are both binding to different IPs.

This resolves the case where daemons bind to * and we redeploy with a
subnet to bind to.  It would eventually converge before, but would
throw a bind error in the process and take longer.

Signed-off-by: Sage Weil <sage@newdream.net>