Add trusted networks deprecating warning (#22487)

* Add trusted networks deprecating warning

* Update auth.py

* Update auth.py

* Update auth.py

* Update auth.py

* Tweak

homeassistant/components/http/auth.py

@@ -190,6 +190,12 @@ def setup_auth(hass, app):
 
         elif (trusted_networks and
               await async_validate_trusted_networks(request)):
+            _LOGGER.warning(
+                'Access from trusted networks without auth token is going to '
+                'be removed in Home Assistant 0.96. Configure the trusted '
+                'networks auth provider or use long-lived access tokens to '
+                'access %s from %s',
+                request.path, request[KEY_REAL_IP])
             authenticated = True
 
         elif (support_legacy and HTTP_HEADER_HA_AUTH in request.headers and