Document use of java.awt.headless for testing
Document use of java.awt.headless for testing

git-svn-id: d3b254b790bfb0dc06e982e64646283fdd6e0f68@554506 13f79535-47bb-0310-9956-ffa450edef68

hizhangqi/jmeter-1,ubikfsabbe/jmeter,tuanhq/jmeter,ra0077/jmeter,vherilier/jmeter,kyroskoh/jmeter,ra0077/jmeter,ThiagoGarciaAlves/jmeter,etnetera/jmeter,ubikloadpack/jmeter,ubikloadpack/jmeter,hizhangqi/jmeter-1,DoctorQ/jmeter,max3163/jmeter,ra0077/jmeter,kschroeder/jmeter,hizhangqi/jmeter-1,fj11/jmeter,irfanah/jmeter,hemikak/jmeter,DoctorQ/jmeter,d0k1/jmeter,thomsonreuters/jmeter,tuanhq/jmeter,kyroskoh/jmeter,thomsonreuters/jmeter,kyroskoh/jmeter,hemikak/jmeter,ubikloadpack/jmeter,etnetera/jmeter,fj11/jmeter,vherilier/jmeter,ubikfsabbe/jmeter,d0k1/jmeter,tuanhq/jmeter,ThiagoGarciaAlves/jmeter,max3163/jmeter,etnetera/jmeter,irfanah/jmeter,etnetera/jmeter,etnetera/jmeter,hemikak/jmeter,max3163/jmeter,fj11/jmeter,DoctorQ/jmeter,kschroeder/jmeter,liwangbest/jmeter,vherilier/jmeter,d0k1/jmeter,ra0077/jmeter,ThiagoGarciaAlves/jmeter,ubikloadpack/jmeter,irfanah/jmeter,kschroeder/jmeter,hemikak/jmeter,liwangbest/jmeter,liwangbest/jmeter,d0k1/jmeter,vherilier/jmeter,ubikfsabbe/jmeter,thomsonreuters/jmeter,ubikfsabbe/jmeter,max3163/jmeter