Don't bother storing client IPs

Since requests proxy via hungry the IP is masked already. Responsibility
for tracking this is no longer with synapse.

synapse/api/auth/internal.py

@@ -115,7 +115,10 @@ async def _wrapped_get_user_by_req(
  Once get_user_by_req has set up the opentracing span, this does the actual work.
  """
  try:
- ip_addr = request.get_client_ip_if_available()
+ # Beep: don't care about client IPs in synapse since hungry proxies (so IP is hungry)
+ ip_addr = ""
+ # ip_addr = request.get_client_ip_if_available()
+
  user_agent = get_request_user_agent(request)
 
  access_token = self.get_access_token_from_request(request)