TEZ-1060 Add randomness to fault tolerance tests
TEZ-1808. Job can fail since name of intermediate files can be too long
in specific situation. Contributed by Tsuyoshi OZAWA.
TEZ-1818. Problem loading tez-api-version-info.properties in case current context classloader in not pointing to Tez jars. (Johannes Zillmann via hitesh)
TEZ-1816. It is possible to receive START event when DAG is failed (zjffdu)