fix undeploy cartridge error
fixes for STRATOS-552

Signed-off-by: M. Isuru Tharanga Chrishantha Perera <isuru@apache.org>
fixing ip retrieval - get the IP if and only if there's no assigned IP
disabling cassandra server start up
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos
fixing class endoint exception
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos