auth-client: Support X-TELEPATHY-PASSWORD for GOA accounts
auth-client: Support X-TELEPATHY-PASSWORD for GOA accounts

If a provider supports more than one authentication mechanism (eg.,
Google), we prefer OAuth2.

Fixes: https://bugzilla.gnome.org/687690

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets