Ftests throw CubeControlException: Could not stop hello-openshift

[hemanik]

Issue Overview

When executing HelloPodOpenShiftITCase or HelloPodDeploymentOpenShiftITCase ftest the following exception is thrown.

Exception in thread "Thread-1" org.arquillian.cube.spi.CubeControlException: Could not stop hello-openshift
	at org.arquillian.cube.spi.CubeControlException.failedStop(CubeControlException.java:23)
	at org.arquillian.cube.openshift.impl.model.BuildablePodCube.stop(BuildablePodCube.java:153)
	at org.arquillian.cube.impl.client.ForceStopDockerContainersShutdownHook.lambda$attachShutDownHookForceStopDockerContainers$0(ForceStopDockerContainersShutdownHook.java:17)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:128)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:105)
	at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:62)
	at org.arquillian.cube.openshift.impl.model.BuildablePodCube.stop(BuildablePodCube.java:142)
	... 2 more

Expected Behaviour

After the session is destroyed the pods should be gracefully stopped and destroyed without any exceptions or errors.

Current Behaviour

CubeControlException: Could not stop hello-openshift is caused due to NPE.

Steps To Reproduce

1. execute HelloPodOpenShiftITCase or HelloPodDeploymentOpenShiftITCase ftest.