OPENAM-4093, CR-4021 - OAuth2 authorize endpoint should strip 'login' option from prompt query parameter of goto (return URL) when redirecting to login URL

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@9751 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
CR-3851

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@9752 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d