Fix 08-ssl-bridge.py test when using async dns lookups.

Thanks to Tatsuzo Osawa.

Bug: https://github.com/eclipse/mosquitto/issues/507

ChangeLog.txt

@@ -6,6 +6,7 @@ Broker:
 - Fix use_identity_as_username not working on websockets clients.
 - Don't crash if an auth plugin returns MOSQ_ERR_AUTH for a username check on
   a websockets client. Closes #490.
+- Fix 08-ssl-bridge.py test when using async dns lookups. Closes #507.
 
 Client library:
 - Fix incorrect PSK key being used if it had leading zeroes.

test/broker/08-ssl-bridge.conf

@@ -4,6 +4,7 @@ connection bridge_test
 address localhost:1888
 topic bridge/# both 0
 notifications false
+restart_timeout 2
 
 #bridge_cafile ../ssl/test-root-ca.crt
 bridge_cafile ../ssl/all-ca.crt