Consider IP whitelist for identity server resolution (#11120)

Signed-off-by: Robert Edström <github@legogris.se>

changelog.d/11120.bugfix

+Identity server connection is no longer ignoring `ip_range_whitelist`.

synapse/handlers/identity.py

@@ -54,7 +54,9 @@ class IdentityHandler:
         self.http_client = SimpleHttpClient(hs)
         # An HTTP client for contacting identity servers specified by clients.
         self.blacklisting_http_client = SimpleHttpClient(
-            hs, ip_blacklist=hs.config.server.federation_ip_range_blacklist
+            hs,
+            ip_blacklist=hs.config.server.federation_ip_range_blacklist,
+            ip_whitelist=hs.config.server.federation_ip_range_whitelist,
         )
         self.federation_http_client = hs.get_federation_http_client()
         self.hs = hs