Skip unreachable APs for Chaos tests.

 - if an AP is registered w/ AFE but unreachable (for some reason)
   at run time, skip it without terminating the test flow.

BUG=chromium:237590
TEST=Manual (run ChaosPSK test w/ tries=1 on all APs and confirmed
             unreachable APs are skipped properly w/o stalling test flow)

Change-Id: I878b656ccac723ed3ec92f18fb13dcb7581c9320
Reviewed-on: https://gerrit.chromium.org/gerrit/50354
Reviewed-by: Kris Rambish <krisr@chromium.org>
Tested-by: Tan Gao <tgao@chromium.org>
1 file changed