[shill] generate proxy for wpa_supplicant D-Bus interface

Shill will be a client of the f1.w1.wpa_supplicant1 D-Bus interface.
(In contrast, Shill will be a provider for the org.chromium.flimflam
D-Bus interface.)

BUG=chromium-os:15092
TEST=make
Change-Id: I485570958ad04c0dd69277f80bfc067f9d770c99
Reviewed-on: http://gerrit.chromium.org/gerrit/645
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
1 file changed