Running this playbook on the puppetmaster we consistently run into ssh
failures due to async reconnecting periodically and network issues
between hosts. We can address this by starting a single connection
without async and polling on that which appears to be the default
wait_for behavior. Testing of this seems to indicate it is more
reliable.
Change-Id: Iec72e2c0d099c0e28bc4b4b48608a03b3e66b4c0