AME-5120 Adds more useful message to Social AuthN UI page

git-svn-id: https://svn.forgerock.org/openam/trunk@11265 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
OPENAM-4274 CR-5073 Merge changes from ScopeImpl to OpenAMScopeValidator, which ensures that scope values will be present on client credential grants.

git-svn-id: https://svn.forgerock.org/openam/trunk@11266 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d