MMS: use the standard monitoring stack

[tzach]

MMS include an out of date example of the monitoring stack https://github.com/scylladb/scylla-code-samples/tree/master/mms/monitoring Instead, we should use the latest project, maybe as git sub module

[tzach]

@amnonh FYI

[tzach]

To connect the standard networking stack to MMS instance one should use

./start-all.sh -v 3.0 -D "--network mms_web"

[guy9]

@tzach please close, fixed here: https://university.scylladb.com/courses/the-mutant-monitoring-system-training-course/lessons/monitoring/