Reverting pluggable authenticators implementation, moving authorization servlet to jaxwebapp as jax-rs endpoint, moving login page to \'applicationauthentication\' webapp, removing custom login page, custom error page, and custom consent page url, adding implicit grant type as choice in OAuth registration page, Applying global grant type restriction to service provider specific grant type configuration

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@176573 a5903396-d722-0410-b921-86c7d4935375