shill: improve conformance with WiFiRoaming tests

This patch makes several changes to get shill passing more of
the WiFiRoaming suite. shill now passes 13 of the 18 tests.

Overview of changes:
- Clean up Services when their last Endpoint disappers.
- Make a new WiFi connection request pre-empt an existing one.
- Make Device::SelectService no-op if new service is same as old.
  (part of resolving crosbug.com/23703)
- Move auto-connect logic to its own function, and run that function
  in a deferred task (partly resolves crosbug.com/24276)
- Add a non-deferred variant of Service::Connect (part of resolving
  crosbug.com/24276).
- Have service sort order reflect whether or not services are
  connecting, failed, connectable, and configured for auto-connect.

BUG=chromium-os:24276,chromium-os:23223,chromium-os:22943,chromium-os:23703
TEST=WiFiRoaming, unit tests, manual

Manual testing: per https://gerrit.chromium.org/gerrit/12963

Collateral changes:
- updated TESTING
- added crosbug.com/24461 for problem with autotest and profiles
- declared some functions as const
- removed some useless comments

Change-Id: I36d6eb7108a377dbf409d3e5673deffb85c0633e
Reviewed-on: https://gerrit.chromium.org/gerrit/12687
Reviewed-by: Thieu Le <thieule@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
Commit-Ready: mukesh agrawal <quiche@chromium.org>
diff --git a/TESTING b/TESTING
index b1ad1e2..16cdca2 100644
--- a/TESTING
+++ b/TESTING
@@ -1,4 +1,4 @@
-Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+Copyright (c) 2012 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.
 
@@ -64,7 +64,7 @@
 - stop flimflam, and start shill
   localhost / # stop flimflam
   localhost / # shill --foreground --v=1000 \
-            --device-black-list=managed0,managed1,mon.managed0,mon.managed1
+            --device-black-list=managed0,managed1
   (the black list keep shill from configuring the devices used by the hostapd
   processes.)