use dynamic port for cassandra testing

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1491404 13f79535-47bb-0310-9956-ffa450edef68
cassandra host from system property

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1491405 13f79535-47bb-0310-9956-ffa450edef68