Improvements to Application Authentication Framework

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180344 a5903396-d722-0410-b921-86c7d4935375
Added Re Authentication prompt upon login failure to BasicAuth Application Authenticator

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180345 a5903396-d722-0410-b921-86c7d4935375