[TEST]use cc_test to run core_worker_test, enforce/reuse RedisServiceManagerForTest

[WangTaoTheTonic]

Why are these changes needed?

Now core_worker_test is ran by scripts run_core_worker_tests.sh, which demand specified location and departed from all other tests.

RedisServiceManagerForTest is used for starting redis server for test cases who need that. Now it could only start one server with random port. We enforce it with multiple redis servers and optional port supporting, thus it can be used by more diverse cases.

We use RedisServiceManagerForTest enforced to start/shutdown redis servers for core_worker_tests and make former reusable.

Related issue number

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• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested (please justify below)

[AmplabJenkins]

Can one of the admins verify this patch?

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[WangTaoTheTonic]

There's a failure test case(about tune restore) which should be unrelated with this pr as it had failed in others.

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[zhijunfu]

LGTM, thanks