Merge -c 1514135 from trunk to branch-2 to fix YARN-1056. Remove dual use of string 'resourcemanager' in yarn.resourcemanager.connect.{max.wait.secs|retry_interval.secs}. Contributed by Karthik Kambatla.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1514136 13f79535-47bb-0310-9956-ffa450edef68