Added simple logging endpoint for fire text inbound SMS calls

- logs post data
- OK to log all as not currently in use so no real user data expected.

tests/app/notifications/test_receive_notification.py

@@ -19,11 +19,12 @@ def test_receive_notification_returns_received_to_mmg(client):
 
 
 def test_receive_notification_returns_received_to_firetext(client):
-    data = {"some": "thing"}
+    data = "source=07999999999&destination=07111111111&message=this is a message&time=2017-01-01 12:00:00"
+
     response = client.post(
         path='/notifications/sms/receive/firetext',
-        data=json.dumps(data),
-        headers=[('Content-Type', 'application/json')])
+        data=data,
+        headers=[('Content-Type', 'application/x-www-form-urlencoded')])
 
     assert response.status_code == 200
     result = json.loads(response.get_data(as_text=True))