tree 2539a466de95579969f4bec5ec0b39cd8ea1b634
parent 6f1d4786165096ee3a23f551cb49497479e22267
author Matthew Wang <matthewmwang@chromium.org> 1524164694 -0700
committer chrome-bot <chrome-bot@chromium.org> 1524722411 -0700

Change autotest bridge interface setup and teardown

Configure hostap to always bring up bridge interfaces with prefix 'hostapbr',
followed by index of bridge interface (instead of a customizable name). This
allows us to clean up the bridge interfaces during autotest setup and
teardown.

Also modify network_WiFi_RoamFT to do extra cleanup.

BUG=chromium:832402
TEST=1) Ran network_WiFi_RoamFT autotests on local DUT and on one of the machines
        affected by crbug/832402, and ran network_WiFi_SimpleConnect.wifi_5HT20
        afterward.
     2) Ran network_WiFi_RoamFT autotests and hit CTRL-C after both APs were
        configured but before tests ran to completion, and verified that bridge
        interfaces hostapbr0 and hostapbr1 were still up. Ran
        network_WiFi_SimpleConnect tests afterward to make sure cleanup was done
        correctly and that tests passed.

Change-Id: Ie17b7484a28a94bee5fdf8116fc25d98124cd2ae
Reviewed-on: https://chromium-review.googlesource.com/1020144
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Matthew Wang <matthewmwang@chromium.org>
Reviewed-by: Kirtika Ruchandani <kirtika@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>