HADOOP-10208. Remove duplicate initialization in StringUtils.getStringCollection. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556602 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10207. TestUserGroupInformation#testLogin is flaky (jxiang via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556664 13f79535-47bb-0310-9956-ffa450edef68