[Java] Use BaseTest to instead of TestListener.

[jovany-wang]

What do these changes do?

In this PR, we use BaseTest to instead of TestListener and MyRunner annotation.

1. Before this changes, the program do Ray.init() only once when we run the command mvn test.
   This is not what we need.
   We expect it to do Ray.init() before each case.

2. Make cleanUp more graceful.

Related issue number

N/A

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[AmplabJenkins]

Test FAILed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/Ray-PRB/10264/
Test FAILed.