Update to test scripts to work with both ModemManager and Cromo

test/mm-poll-signal-strength

Index: test/mm-poll-signal-strength
diff --git a/test/mm-poll-signal-strength b/test/mm-poll-signal-strength
index 362fa38de694e8b789dee3660eda4afcdc789429..e8dd0b29f7fa0d0b22e73628ae4bbaffc443efc2 100755
--- a/test/mm-poll-signal-strength
+++ b/test/mm-poll-signal-strength
@@ -1,5 +1,9 @@
 #!/usr/bin/python
 
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 import re
 import sys
 import time
@@ -13,8 +17,7 @@ TIME = 60
 SAMPLES = TIME * 2
 
 
-manager = mm.ModemManager()
-path = mm.PickOneModem(manager, '')
+manager, path = mm.PickOneModem('')
 simple_modem = manager.SimpleModem(path)
 
 strengths = []  # list of lists where list[i] is dbm for interface #i