HADOOP-11007. Reinstate building of ant tasks support. Contributed by
Jason Lowe.
Missing files from the previous commit of HADOOP-11007
HADOOP-11169. Fix DelegationTokenAuthenticatedURL to pass the connection Configurator to the authenticator. (Arun Suresh via wang)
HADOOP-11172. Improve error message in Shell#runCommand on OutOfMemoryError. (Yongjun Zhang via wang)
Fixup for CHANGES.txt
HDFS-7128. Decommission slows way down when it gets towards the end. Contributed by Ming Ma.