Document that this is an internal JMeter file

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1613052 13f79535-47bb-0310-9956-ffa450edef68
Tweak

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1613059 13f79535-47bb-0310-9956-ffa450edef68