lkl: fix valgrind tests remained issues

The 30mins timeout isn't sometime enough so increase to 90 mins.  The
junit xml collection process was also broken on valgrind tests.  This
fixes those issues.

Signed-off-by: Hajime Tazaki <thehajime@gmail.com>

.circleci/config.yml

@@ -74,9 +74,10 @@ do_steps: &do_steps
         if [[ -n "$VALGRIND" ]]; then
           cd ./tools/lkl/ && find ./ -type f -name "valgrind-*.xml" \
              -exec ./tests/valgrind2xunit.py {} \;
+          cd ../..
         fi
         find ./tools/lkl/ -type f -name "*.xml" -exec mv {} ~/junit/ \;
-      no_output_timeout: "30m"
+      no_output_timeout: "90m"
   - store_test_results:
       path: ~/junit
   - store_artifacts: