hg: jdk9/hs/hotspot: 8162670: make of jtreg_tests fails if no tests are run, causing jprt test runs to also fail

[chris.plummer at oracle.com]

Changeset: d1b82242e2db
Author:    cjplummer
Date:      2016-08-04 16:11 -0700
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/d1b82242e2db

8162670: make of jtreg_tests fails if no tests are run, causing jprt test runs to also fail
Summary: Clear the jtreg exit code when set to 1.
Reviewed-by: stsmirno, dholmes

! test/Makefile