YARN-1425. TestRMRestart fails because MockRM.waitForState(AttemptId) uses current attempt instead of the attempt passed as argument (Omkar Vinit Joshi via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1543952 13f79535-47bb-0310-9956-ffa450edef68