[autotest] Move site_wlan scripts under client/

Code that's intended to be used on a DUT should live underneath
the client/ subtree in the autotest repo, as it will then be
automatically copied over when autotests are run.

BUG=chromium-os:35757
TEST=network_WiFiRoaming/010RetryReconnectHidden

Change-Id: I23dcb2d3e37719472849c10cf1dc853b2b7b7e58
Reviewed-on: https://gerrit.chromium.org/gerrit/36703
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Ready: Chris Masone <cmasone@chromium.org>
7 files changed