Bug 55932 Create a Async BackendListener to allow easy plug of new listener (Graphite, JDBC, Console,...)
Add missing property to jmeter.properties
Bugzilla Id: 55932

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1645527 13f79535-47bb-0310-9956-ffa450edef68