Revert "feature(cluster.py): support new directory structure of unified package"
Revert "feature(cluster.py): support new directory structure of unified package"

This reverts commit cba1c338afc31fbd4262678ff95c224f50cad094.

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