http request healthcheck

###Name Healthcheck

###Usage This endpoint is used as a healthcheck of Burrow, whether for monitoring or load balancing within a VIP.

###URL path GET /burrow/admin

###Parameters None

###Response The response is always the simple string "GOOD"

###Possible errors As long as the HTTP server is running, this request will never return an error. It has no parameters to be specified incorrectly, and no processing is done in Burrow.