adding Statistics and Event Trace support

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172182 a5903396-d722-0410-b921-86c7d4935375
Updating log

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172183 a5903396-d722-0410-b921-86c7d4935375