HADOOP-9897. Add method to get path start position without drive specifier in o.a.h.fs.Path. Contributed by Binglin Chang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532880 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5586. TestCopyMapper#testCopyFailOnBlockSizeDifference fails when run from hadoop-tools/hadoop-distcp directory (jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532887 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5370. Typo in Error Message: different between range in condition and range in error message. Contributed by Kousuke Saruta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532899 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10005. No need to check INFO severity level is enabled or not. Contributed by Jackie Chang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532907 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5346. Avoid unnecessary call to getNumLiveDataNodes() for each block during IBR processing. Contributed by Ravi Prakash.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532915 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9078. enhance unit-test coverage of class org.apache.hadoop.fs.FileContext (Ivan A. Veselovsky via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532928 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5360. Improvement of usage message of renameSnapshot and deleteSnapshot. Contributed by Shinichi Yamashita.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532930 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd