Extend monitoring to include monitoring docker containers

[rokruzic]

It happens relatively often in our yugaware, that some of docker containers stop running. For instance, just tonight, prometheus container wasn't running, and yugaware restart didn't start it. Monitoring didn't catch that.

It would be very helpful, if the monitoring script could be extended so that it also checks, whether all the docker containers, that are supposed to be running, are in fact running. It should check for the replicated container, prometheus, yugaware, etc etc.

Can this be added in one of future releases?