MAPREDUCE-5070. TestClusterStatus.testClusterMetrics fails on JDK7. (tucu)

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MAPREDUCE-5072. TestDelegationTokenRenewal.testDTRenewal fails in MR1 on jdk7. (sandyr via tucu)

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MAPREDUCE-5073. TestJobStatusPersistency.testPersistency fails on JDK7. (sandyr via tucu)

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Reverting MAPREDUCE-5038 (commit 1454129)

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MAPREDUCE-5038. old API CombineFileInputFormat missing fixes that are in new API. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1458021 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4622. Remove redundant synchronized from FSNamesystem#rollEditLog in branch-1. Contributed by Jing Zhao.

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