cache_hitrate_calculator: filter cfs based on replication strategy instead of a name
cache_hitrate_calculator: filter cfs based on replication strategy instead of a name

The code filters CFs by name to not include system keyspace, but v3
schema added yet another system namespace. Better filter according to
replication strategy to accommodate for schema v4 adding even more
system keyspaces.

Fixes: #2516

Message-Id: <91fc5c26eb186bf3def7f1a4c19cec8e088e2007@scylladb.com>

avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla