8168412: Reduce buffering in jtreg timeouthandlerReviewed-by: mlarsson
8166262: failurehandler should not use jtreg internal APIReviewed-by: sla, dsamersoff
8132961: JEP 279: Improve Test-Failure TroubleshootingReviewed-by: lmesnik, slaContributed-by: kirill.shirokov@oracle.com, dmitry.fazunenko@oracle.com, kirill.zhaldybin@oracle.com, igor.ignatyev@oracle.com