Do not reload grpc in unit tests

This can break subsequently run tests, including any which have already
stored references to gRPC enums (such as grpc.StatusCode.OK). The
subsequent tests will compare now be comparing the old enums to the
reloaded enums, and they will not match. This causes errors in
_metadata_code_details_test and a hang in _metadata_flags_test, when run
in sequence locally after _logging_test.

It's unclear why this has been working on Kokoro, but it is reproducible
locally and is behavior that should be avoided.

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