AMBARI-4429. Write unnitests for MAPREDUCE1 install script (Arsen Babych
via aonishuk)
AMBARI-4434. Add unittets for service_check for YARN, ZK, WEBHCAT, HIVE
(Arsen Babych via aonishuk)
AMBARI-4425. Add upgradestack support for MySQL.(vbrodetskyi)