MAPREDUCE-6029. TestCommitterEventHandler fails in trunk. Contributed by Mit Desai
(cherry picked from commit 2e789eb2261fa607489d8ae630fb77e8147d0266)
YARN-1857. CapacityScheduler headroom doesn't account for other AM's running. Contributed by Chen He and Craig Welch
(cherry picked from commit 30d56fdbb40d06c4e267d6c314c8c767a7adc6a3)
HADOOP-11007. Reinstate building of ant tasks support. Contributed by
Jason Lowe.
(cherry picked from commit 99d7a452be91b3aefe9bcde9b51893ff6719742e)
Missing files from the previous commit of HADOOP-11007
Fix version in pom.xml from HADOOP-11007 in branch-2.6
HADOOP-11169. Fix DelegationTokenAuthenticatedURL to pass the connection Configurator to the authenticator. (Arun Suresh via wang)

(cherry picked from commit b2f619752355d4ef6733935c020f57c8a26d82e1)