getting port ffset from carbon util method

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@169849 a5903396-d722-0410-b921-86c7d4935375
making cassandra port offset to read from carbon util method

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@169850 a5903396-d722-0410-b921-86c7d4935375