mercury: add "argv" to pymercury params

Author: jmlapre

src/sst/elements/mercury/pymercury.py

@@ -97,6 +97,7 @@ def __init__(self):
                                      ])
         self._declareParamsWithUserPrefix("params","app1",
                                           ["name",
+                                           "argv",
                                            "exe_library_name",
                                            "libraries",
                                            "dependencies",