AMBARI-3644. App.ServiceConfig needs 'defaultsProvider' mechanism. (onechiporenko via srimanth)
AMBARI-3675: Default value of 'Default virtual memory for a job's map-task' is not valid. [Merged] (jaimin)
AMBARI-3687. Default YARN/MR2 AM mem defaults are empty. (srimanth)
AMBARI-3689: Invalid java opts configs in mapred-site. (jaimin)
AMBARI-3697. JS exception trying to calculate dynamic configs in branch-1.4. (srimanth)
AMBARI-3707. YARN dynamic configs generate 0 map/reduce memory on 2GB machines. (srimanth)
AMBARI-3699. App.ServiceConfig needs 'configsValidator' validating across service values. (onechiporenko, srimanth via srimanth)
AMBARI-3708. Reconfigure of dynamic configs not showing modified values. (srimanth)
AMBARI-3719. YARN default number of containers calculation skewed towards heavier resources. (srimanth)
AMBARI-3743. YARN dynamic configs generate 0 values nodes. (srimanth)
AMBARI-3752. MR jobs are hanging on a 2-node cluster with default configuration. (srimanth)

Conflicts:
	ambari-web/app/utils/configs/defaults_providers/yarn_defaults_provider.js
AMBARI-3752. MR jobs are hanging on a 2-node cluster with default configuration. Fixing missed memory. (srimanth)