mod_http_oauth2: Handle login_hint without @hostpart
Makes life easier for the client when it does not know the full JID,
which might not have the same hostpart as the authorization server URL.
This module helps reduces power usage of inactive mobile clients while
another client is actively used. E.g. in the case of chatting on a
desktop computer, instantly pushing messages to a phone in someones
pocket is not the best use of radio time.
Works with [mod_csi_simple][doc:modules:mod_csi_simple] which is
included with Prosody since 0.11