Fixing the tenant login issue

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@177961 a5903396-d722-0410-b921-86c7d4935375
removed Disable attribute

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@177963 a5903396-d722-0410-b921-86c7d4935375
Make sure that the last valve is a no-op valve

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@177964 a5903396-d722-0410-b921-86c7d4935375