Add a GC option for perm cleanup Add explanation on NEW zone
Add a GC option for perm cleanup
Add explanation on NEW zone

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1507418 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 5792ceb9928938ce5a43124715db40de8c080ace
etnetera/jmeter,etnetera/jmeter,etnetera/jmeter,apache/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,apache/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,ham1/jmeter,etnetera/jmeter,benbenw/jmeter