HBASE-8381 TestTableInputFormatScan on Hadoop 2 fails because YARN kills our applications

This patch bumps up the vmem-pmem ratio so that yarn's resource checker does not kill jobs that exceed the vmem (virtual memory!) allocation limit.  Related to HBASE-6330.


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1471570 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd
Merge remote branch 'origin/0.94-gd' into fb-YAHOO-317-0.94-gd