TEZ-1642. TestAMRecovery sometimes fail. (zjffdu)
TEZ-1746. addendum. Increase the timeout of TestExceptionPropagation.testExceptionPropagationSession
Revert "TEZ-1642. TestAMRecovery sometimes fail. (zjffdu)"

This reverts commit 6dda1d77bcd6460780144ae2aab905c2a255e94a.
TEZ-1687. Use logIdentifier of Vertex for logging (zjffdu)