HADOOP-9551. Backport common utils introduced with HADOOP-9413 to branch-1-win. Contributed by Ivan Mitic.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1512864 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9802. Support Snappy codec on Windows. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1-win@1512878 13f79535-47bb-0310-9956-ffa450edef68