Code review comment for lp:~fwereade/pyjuju/provider-base

[1] addressed in https://code.launchpad.net/~fwereade/ensemble/provider-base-launch-machine/+merge/71850 (now merged); includes a general rename of "bootstrap" -- in the narrow context of launching a machine which will run a zookeeper and a provisioning agent, as opposed to the broader start-ensemble-itself context -- to "master".