autotest: modify WiFi-related test code, to enable testing of
WiFi connection managers in a VM. the VM is assumed to run a
cros-dev image (which has been modified for test).

BUG=chromium-os:16348
TEST=VPN,WiFiManager,WiFiMatFunc,WiFiPerf,WiFiRoaming,WiFiSecMat

the above test suites were run in the RF lab. testing yielded some
failures, but no new failures as compared to unmodified tests on the
same hardware. additionally, the WiFiManager suite was tested in
the VM, with no failures.

Change-Id: Ib207017d0eb73fa36c940a00ab1aa50993839280
Reviewed-on: http://gerrit.chromium.org/gerrit/6405
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
7 files changed