One of two CloudConnections sometimes fails to connect and never tries to reconnect

[alebianchin]

Describe the bug
If you have two different CloudConnections sometimes at startup one of them can't connect and throws this Exception :

java.lang.IllegalArgumentException: no NetworkModule installed for scheme "ssl" of URI "ssl://broker-sbx.everyware.io:8883"
        at org.eclipse.paho.client.mqttv3.internal.NetworkModuleService.validateURI(NetworkModuleService.java:70)
        at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:454)
        at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:320)
        at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:315)
        at org.eclipse.kura.core.data.transport.mqtt.MqttDataTransport.setupMqttSession(MqttDataTransport.java:978)
        at org.eclipse.kura.core.data.transport.mqtt.MqttDataTransport.connect(MqttDataTransport.java:291)
        at org.eclipse.kura.core.data.DataServiceImpl$2.run(DataServiceImpl.java:606)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

To Reproduce
It is not easy to reproduce this issue since it rarely happens.
Steps to reproduce the behavior:

1. Create two CloudConnections
2. Create a WireGraph with two publisher using each of the Connection
3. Reboot
4. Sometimes you will see the error at startup.

Expected behavior
The calling thread should not die and try to reconnect after, instead it get killed by an uncatched RuntimeException thrown by paho.

Target Environment (please complete the following information):

• Kura 4.1