bot affinity 1 is broken on internal.client.clank/health-plan-clankium-phone, affecting 1 tests

Builders failed on: 
- health-plan-clankium-phone: 
  http://master7.golo.chromium.org/i/internal.client.clank/builders/health-plan-clankium-phone

https://uberchromegw.corp.google.com/i/internal.client.clank/builders/health-plan-clankium-phone?numbuilds=200

power.typical_10_mobile looks flaky, and the failing sites were different each time. The failure rate became pretty high on 2017-05-23 and 24.

Observations from https://uberchromegw.corp.google.com/i/internal.client.clank/builders/health-plan-clankium-phone/builds/4609/steps/power.typical_10_mobile/logs/stdio :

For each test, error messages about Websocket not available would be there for a few seconds. It looks like this:
(INFO) 2017-05-24 08:09:16,435 devtools_client_backend._IsInspectorWebsocketAvailable:56  Websocket at port 41560 not yet available: [Errno 104] Connection reset by peer

In some cases, this error would last for a long time, and it would eventually time out after 60 seconds.