removing and merging the latest src for databridge.persistence.cassandra form branch

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@162860 a5903396-d722-0410-b921-86c7d4935375
removing and merging the latest src for databridge.persistence.cassandra form branch - patch from rasika in fixing WSAS-1132

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@162861 a5903396-d722-0410-b921-86c7d4935375