MAPREDUCE-5232. Add a configuration to be able to log classpath and other system properties on mapreduce JVMs startup. Contributed by Sangjin Lee.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482643 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-270-trunk-gd