Don't check for updates immediately with at-once updates
Don't check for updates immediately with at-once updates

With at-once updates, we would start a service and then immediately
check to see if a new one was available. In certain pathological
cases (namely, quickly crashing-and-restarting services), this could
result in an excess of updater threads and over-consumption of network
resources.

This does not completely solve that issue, but should help ameliorate
it.

Signed-off-by: Christopher Maier <b4598f17a90ef80817bae8ad6c37249740caafb4@chef.io>

habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat