Test to make sure that AM failures propagate to the YARN state -this was not the case in 2.1.0-beta
explicitly switch to 2.1.1-SNAPSHOT, to stay up with the changes
note that you need to build up hadoop home for accumulo too
make it easier for test runs to get the app report of a cluster
ClusterDescription adds a getMandatoryOption method
RoleLauncher catches all exceptions
RunLongLivedApp checks and reports on a null value
accumulo provider requires hadoop and ZK home set
# options marked as site. are automatically mapped to service site XML options.
# process execution is modeled with its own YARN service; the AM catches the service state change and reacts to it