This CQ slave run failed:
    https://luci-milo.appspot.com/buildbot/chromeos/edgar-paladin/2491

The problem seems to have been slowness/lack or response from the
devserver.  The logs show that this operation timed out repeatedly:
03/21 06:07:32.735 DEBUG|             utils:0214| Running 'ssh 100.115.245.197 'curl "http://100.115.245.197:8082/list_suite_controls?suite_name=suite_attr_wrapper&build=edgar-paladin/R67-10506.0.0-rc1"''