Integration tests: Implement test_fault_tolerance

2 question:

1. In [CliqueOracleTest], there are 3 test cases to test the value of fault tolerance. Should I implement all the test cases in the integration tests?

2. And I can not find a way to generate a correct justification map like the unit test do in scala. It is very difficult because in the integration test we do the test in the same machine which means other validator can get the blocks from others in a very short time. I think we should look for other ways to test the case instead of simulating the situation in scala test.