svn merge -c 1612358 FIXES: MAPREDUCE-5957. AM throws ClassNotFoundException with job classloader enabled if custom output format/committer is used. Contributed by Sangjin Lee


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612371 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10857. Native Libraries Guide does not mention a dependency on openssl-development package (ozawa via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612385 13f79535-47bb-0310-9956-ffa450edef68