adding cassandra v4

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@175474 a5903396-d722-0410-b921-86c7d4935375
updating cassandra orbit

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@175475 a5903396-d722-0410-b921-86c7d4935375
adding cassandra and orbit

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@175476 a5903396-d722-0410-b921-86c7d4935375
Merging branch with trunk

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@175478 a5903396-d722-0410-b921-86c7d4935375