svn merge -c 1562482 FIXES: YARN-1600. RM does not startup when security is enabled without spnego configured. Contributed by Haohui Mai


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.3@1562484 13f79535-47bb-0310-9956-ffa450edef68