https://issues.apache.org/jira/browse/AMQ-4848 - added NetworkConnectors...

Fixed activemq:list command and it now displays the following output in karaf:

```javascript
JBossA-MQ:karaf@root> activemq:list



TransportConnectors = {openwire=tcp://localhost:38009?maximumConnections=1000}
BrokerName = amq-broker





TransportConnectors = {openwire=tcp://localhost:61616?maximumConnections=1000}
BrokerName = amq
```