Collect WiFi router logs on test conclusion

BUG=chromium:395810
TEST=network_WiFi_SimpleConnect.wifi_checkWPA_TKIP still passes.
Suddenly, logs appear.

Change-Id: Ic5ccf4b9ab2c3913ca10050808c118630afbb658
Reviewed-on: https://chromium-review.googlesource.com/209508
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed