use forked CL2 in load-slos (#484)

Author: mengqiy

tests/tasks/generators/clusterloader/load-slos.yaml

@@ -9,7 +9,7 @@ spec:
   params:
   - name: giturl
     description: "git url to clone the package"
-    default: https://github.com/kubernetes/perf-tests.git
+    default: https://github.com/mengqiy/perf-tests.git
   - name: cl2-branch
     description: "The branch of clusterloader2 you want to use"
     default: "master"