fix(logcollector): collect the cassandra-rackdc.properties file
fix(logcollector): collect the cassandra-rackdc.properties file

currently on on k8s we collect this file, this commit
add the collection of `cassandra-rackdc.properties`

Trello: https://trello.com/c/Lh9wUT4j

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