org.eclipse.che.plugin.docker.machine.MachineProviderImplTest.setUp test is failing randomly on CI

[benoitf]

We have PR jenkins jobs that fails very often with the error :

org.eclipse.che.plugin.docker.machine.MachineProviderImplTest.setUp
Error Message

'getContainerLogs' is a *void method* and it *cannot* be stubbed with a *return value*!
Voids are usually stubbed with Throwables:
    doThrow(exception).when(mock).someVoidMethod();

so we need to launch again the tests...so jenkins jobs take longer to perform as we run them more than once.
Maybe there is wrong init/cleanup sequence in the tests

Reproduction Steps:
Jenkins PR jobs like
https://ci.codenvycorp.com/job/che-pullrequests-build/org.eclipse.che.plugin$che-plugin-docker-machine/3009/testReport/

[garagatyi]

If issue appear again, please, reopen the issue