Only call System.exit() for non-GUI client sessions; Tidy up default icon properties
Only call System.exit() for non-GUI client sessions;
Tidy up default icon properties

git-svn-id: https://svn.apache.org/repos/asf/jakarta/jmeter/trunk@585626 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 0c8498d92e3854593b312ae613806df3f610bfaa
etnetera/jmeter,apache/jmeter,benbenw/jmeter,benbenw/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,apache/jmeter,apache/jmeter,ham1/jmeter,benbenw/jmeter,etnetera/jmeter,ham1/jmeter,etnetera/jmeter,etnetera/jmeter,etnetera/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter