Clarify that we want a single class constructor.
Clarify that we want a single class constructor.

part of #409 on github


git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1843938 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 0e941d0d1d0b1fb75f4d1ffbe8149d0ba273f733
apache/jmeter,etnetera/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,benbenw/jmeter,ham1/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter