Adding tst direct execution

src/pyutil/apiutil.py

@@ -115,7 +115,7 @@ def do_tst_command(jobj, root_uuid=str(uuid.uuid4()), ns="/op0"):
     if len(jobj["children"]) != 1:
         print("ERROR: Not a simple TST")
     tstobj = jobj
-    tstobj["common_params"]["execunit"] = "/op0"
+    tstobj["common_params"]["execunit"] = ns
     tstobj["common_params"]["node-uuid"] = root_uuid
     cleanup_tst(tstobj)
     termobj = tstobj["children"][0]