HADOOP-10678. SecurityUtil has unnecessary synchronization on collection used for only tests. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602473 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9629.  Set svn:ignore on new hadoop-tools/hadoop-azure directory.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602476 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9629. Correct svn:ignore on new hadoop-tools/hadoop-azure directory.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602477 13f79535-47bb-0310-9956-ffa450edef68