Initial changes... just need to get taskcluster-client update and pulse ...

Need updated taskcluster-client (I have published that update yet)
and a way for pulse credentials to make their way into tests and into runtime.js
just need to grab the config and stuff it somewhere we already load the test config in this file here: https://github.com/taskcluster/docker-worker/blob/pulse-migration/test/testworker.js#L33