HDFS-7107. Avoid Findbugs warning for synchronization on AbstractNNFailoverProxyProvider#fallbackToSimpleAuth. Contributed by Chris Nauroth.
HDFS-7109. TestDataStorage does not release file locks between tests. Contributed by Chris Nauroth.
HDFS-7110. Skip tests related to short-circuit read on platforms that do not currently implement short-circuit read. Contributed by Chris Nauroth.
YARN-2452. TestRMApplicationHistoryWriter fails with FairScheduler. (Zhihai Xu via kasha)
HDFS-6987. Move CipherSuite xattr information up to the encryption zone root. Contributed by Zhe Zhang.
Merge branch 'apache-trunk' into HDFS-7106
HDFS-7106: code review feedback