renaming core directory to core-old

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@187319 a5903396-d722-0410-b921-86c7d4935375
adding new core directory which will be used for C5 new components

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@187320 a5903396-d722-0410-b921-86c7d4935375