[DCOS-51454] Remove irrelevant Mesos REPL test

[farhan5900]

Reference PR#54

What changes were proposed in this pull request?

removed not working test which started failing when MESOS_NATIVE_JAVA_LIBRARY environment variable is set. Justification:

• current cluster url localquiet will never pass a regexp check when SparkContext is created
• if change cluster url to local then there's no point in checking for Mesos integration specifically
• the presence of MESOS_NATIVE_JAVA_LIBRARY environment variable doesn't mean that Mesos is available while Mesos native lib is used for building Mesos Cluster Scheduler
• this is an integration test which assumes Mesos cluster availability and doesn't play well with the rest of the tests (there's no YARN or K8s tests)

Does this PR introduce any user-facing change?

No

How was this patch tested?

• Added Unit Test

[farhan5900]

This PR is just for reference, so final and effective change has been moved to #69.