[autotest] audio_Audio*: raise TestFail when node is wrong

When the selected node on Cros device is wrong, the test should raise
TestFail, not TestError.

BUG=None
TEST=None

Change-Id: I84add0f70fac33d9ca9c078d29d169fb14c07140
Reviewed-on: https://chromium-review.googlesource.com/300648
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
9 files changed