HADOOP-8857. hadoop.http.authentication.signature.secret.file docs should not state that secret is randomly generated. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1441567 13f79535-47bb-0310-9956-ffa450edef68
 HADOOP-9231. Parametrize staging URL for the uniformity of distributionManagement. (Konstantin Boudnik via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1441569 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9124. SortedMapWritable violates contract of Map interface for equals() and hashCode(). (Surenkumar Nihalani via tgraves)

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merge -r 1213536:1213537 Merging from trunk to branch-0.23 to fix HDFS-1765

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MAPREDUCE-4969. TestKeyValueTextInputFormat test fails with Open JDK 7. (Arpit Agarwal via tgraves)

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MAPREDUCE-4949. Enable multiple pi jobs to run in parallel. (sandyr via tucu)

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