HDFS-6470. TestBPOfferService.testBPInitErrorHandling is flaky. Contributed by Ming Ma.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602490 13f79535-47bb-0310-9956-ffa450edef68
HDFS-2856: clean up TestSaslDataTransfer.
HDFS-2856: improve logging of SaslPropertiesResolver initialization.
HADOOP-10688. Expose thread-level FileSystem StatisticsData (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602516 13f79535-47bb-0310-9956-ffa450edef68
HDFS-2856: add balancer tests and fix bug
HDFS-2856: correct TestSaslDataTransfer test directory.
Merge branch 'trunk' into HDFS-2856