Bug 54451 - Response Time Graph reports wrong times when the are many samples for same time

Also fixed OOM in getData() introduced by 54287 (reset of values was not impacted to use Long.MAX_VALUE and Long.MIN_VALUE)
Bugzilla Id: 54451

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1435860 13f79535-47bb-0310-9956-ffa450edef68