incomplete
kazoo health check & refactor

moved kazoo health checking to seperate function. Its now a separate
system that has its own check. This makes it easier and cleaner. Also,
timing out individual health checks in HealthChecker instead of each one
doing the same.
Health check timeout test added
Correct docs - thanks @cyli
kazoo health and cass health tests

Updated based on different health check functions
lint fix
Merge pull request #614 from rackerlabs/kz-lock-health

Kazoo lock health and refactor