Don't run MQTT V5 tests on this branch for now (see vertx)

Author: Ian Craggs

.travis.yml

@@ -21,7 +21,7 @@ before_install:
 script:
   - mvn -B clean -q
   - mvn -B --projects org.eclipse.paho.client.mqttv3,org.eclipse.paho.client.mqttv3.test test -q
-  - mvn -B --projects org.eclipse.paho.mqttv5.common,org.eclipse.paho.mqttv5.client,org.eclipse.paho.mqttv5.client.test test -q
+# - mvn -B --projects org.eclipse.paho.mqttv5.common,org.eclipse.paho.mqttv5.client,org.eclipse.paho.mqttv5.client.test test -q
 
 #addons:
 #  apt: