issue #2339 - don't require that an IdP supply a specific text string to indicate that the user is not authenticated
update frontend tests, now that an unknown provisioning error collapses into user must auth
Allow action.message to be defined whenever calling the function returned from getErrorDialog.
Make sure the title and message for getErrorDialog are properly escaped when displayed.
Merge pull request #3081 from mozilla/issue2339

don't require that an IdP supply a specific text string to indicate that the user is not authenticated