YTA-214 Provide success or failure in exit status.

This only affects starting binary services from the sm command line utility.
Additionally, starting binary services from the sm command line utility will now respect the wait flag, if provided.
It is.
Dropwizard services use the admin port for their health-check, so rather than the 8080/helloworld that the service declares, this was trying to call 8081/helloworld, which returned 404 and a 404 page, which used to be enough to pass the match-all healthcheck.
As we need a 200 as well now, and the service appears to have an endpoint at 8081/ping that returns pong, I figured we could just use that. :)