autotest: Migrates network_WiFiRoaming/004SuspendTimeout to new method.

Replaces network_WiFiRoaming/004SuspendTimeout test with script and control
file in network_WiFi_RoamSuspendTimeout directory.  New code conforms to test
infrastructure changes provided to address crbug.com/224443.

In this test, the DUT connects to the AP and goes to sleep.  While the
DUT is asleep, the AP deauths the DUT.  The test checks to see whether
the DUT reconnects after it wakes up.

BUG=chromium:263889
TEST=autotest

Change-Id: I7783c342fbe5d9fcd97d4b333996e70f58df55e4
Reviewed-on: https://chromium-review.googlesource.com/176010
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Wade Guthrie <wdg@chromium.org>
Commit-Queue: Wade Guthrie <wdg@chromium.org>
Tested-by: Wade Guthrie <wdg@chromium.org>
15 files changed