HADOOP-9174. TestSecurityUtil fails with Open JDK 7. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1428102 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9175. TestWritableName fails with Open JDK 7. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1428105 13f79535-47bb-0310-9956-ffa450edef68