Fix post gate hook to accommodate for new os-testr

New os-testr uses stestr under the hood, which creates .stestr but not
.testrepository directory in the current dir. Other than that, it
doesn't seem like there is any difference in the format or names of
files generated in the directory.

Change-Id: I9b7fbba2fe7657bed53f74a22d36ad5116269f69
Closes-bug: #1716746

tacker/tests/contrib/post_test_hook.sh

@@ -38,11 +38,11 @@ function generate_test_logs {
 function generate_testr_results {
     # Give job user rights to access tox logs
     sudo -H -u $owner chmod o+rw .
-    sudo -H -u $owner chmod o+rw -R .testrepository
-    if [ -f ".testrepository/0" ] ; then
-        .tox/$venv/bin/subunit-1to2 < .testrepository/0 > ./testrepository.subunit
-        $SCRIPTS_DIR/subunit2html ./testrepository.subunit testr_results.html
-        gzip -9 ./testrepository.subunit
+    sudo -H -u $owner chmod o+rw -R .stestr
+    if [ -f ".stestr/0" ] ; then
+        .tox/$venv/bin/subunit-1to2 < .stestr/0 > ./stestr.subunit
+        $SCRIPTS_DIR/subunit2html ./stestr.subunit testr_results.html
+        gzip -9 ./stestr.subunit
         gzip -9 ./testr_results.html
         sudo mv ./*.gz /opt/stack/logs/
     fi