AMBARI-3308. Parallelize events on the ambari agent wherein the agent can run start/stop/configure/install in parallel. (dlysnichenko)
AMBARI-3307. Fix Unit tests and create new test for step3 installer. (onechiporenko)
AMBARI-3310. HDFS service check should not be disabled when NN HA is enabled and one NN is down. (onechiporenko)