Use new location of subunit2html

The previous location is going away, this location is preferred.

Change-Id: I3558cc0cbd483cb42f2094e180d74fb976d06839
Closes-Bug: #1489404
diff --git a/ceilometer/tests/integration/hooks/post_test_hook.sh b/ceilometer/tests/integration/hooks/post_test_hook.sh
index 00851e5..1443746 100755
--- a/ceilometer/tests/integration/hooks/post_test_hook.sh
+++ b/ceilometer/tests/integration/hooks/post_test_hook.sh
@@ -18,7 +18,7 @@
     if [ -f .testrepository/0 ]; then
         sudo .tox/functional/bin/testr last --subunit > $WORKSPACE/testrepository.subunit
         sudo mv $WORKSPACE/testrepository.subunit $BASE/logs/testrepository.subunit
-        sudo .tox/functional/bin/python /usr/local/jenkins/slave_scripts/subunit2html.py $BASE/logs/testrepository.subunit $BASE/logs/testr_results.html
+        sudo /usr/os-testr-env/bin/subunit2html $BASE/logs/testrepository.subunit $BASE/logs/testr_results.html
         sudo gzip -9 $BASE/logs/testrepository.subunit
         sudo gzip -9 $BASE/logs/testr_results.html
         sudo chown jenkins:jenkins $BASE/logs/testrepository.subunit.gz $BASE/logs/testr_results.html.gz