Default JTREG_VERBOSE value was changed from "fail,error,time" to "fail,error,summary" after switching to run-test framework (JDK-8212028).
Having compact tests output is good for local users while seeing more test execution information is better for mach5 testing.
Specially having test time execution data will help to analyze any tests/jobs slowness. This small patch restores JTREG_VERBOSE value for mach5 testing.