faft: Check USB being plugged in before running firmware screen shutdown tests
The FwScreenCloseLid and FwScreenPressPower require USB being plugged in.
Should check it first in the beginning to avoid the exception later.
BUG=chromium-os:19710
TEST=run_remote_tests.sh --board daisy --remote=dut FwScreenPressPower
Change-Id: Id842023d772dc31a49be695b0835fa930f171068
Reviewed-on: https://gerrit.chromium.org/gerrit/36021
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
2 files changed