improvement(limited_chaos_monkey): adding other disruptions
improvement(limited_chaos_monkey): adding other disruptions

adding mgmt_repair, no_corrupt_repair and abort_repair to
see some repair tasks on this nemesis.
also, adding few other non disruptive tests:
snapshot_operations, mgmt_backup and add_drop_column.

scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests