Replace custom AssertionFailedErrors in test harness based on org.junit#2348

HeikoKlare merged 1 commit intoeclipse-platform:mastereclipse-platform/eclipse.platform:masterfrom

HeikoKlare:assertionfailederror-tests.harnessHeikoKlare/eclipse.platform:assertionfailederror-tests.harnessCopy head branch name to clipboard