slaprunner: don't tell user false assumptions.

If we don't know, we don't know.

slapos/runner/gittools.py

@@ -24,7 +24,7 @@ def cloneRepo(data):
   workDir = data['path']
   if not workDir:
     return jsonify(code=0,
-                   result="Cannot create project folder: Permission Denied")
+                   result="Cannot create project folder.")
   code = 0
   json = ""
   try: