[shill] Wire shill to dbus

Refactor necessary classes into their own headers and such as well.

BUG=chromium-os:15578
TEST=unit tests, shill --foreground on device

Change-Id: Ib9c5a0e9dab779ecc44c1d0144035f5a09e1086e
Reviewed-on: http://gerrit.chromium.org/gerrit/1307
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
21 files changed