Revert "fix(snitch_test.py): remove legacy snitch test module"
Revert "fix(snitch_test.py): remove legacy snitch test module"

This reverts commit 323a76e60e0ade99e4e1a6eaf505f2167afd9f0c.

Since the snitch test function in the artifact test never runs with a multi
dc cluster (there's no multi dc artifact scenario) we're reinstating
snitch_test.py

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