HADOOP-8917. add LOCALE.US to toLowerCase in SecurityUtil.replacePattern. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1450573 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8917. Changed contributed by from Arpit Agarwal to Arpit Gupta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1450574 13f79535-47bb-0310-9956-ffa450edef68