Hc updates

[fredclausen]

Not tested / not ready to merge yet, but this update does the following:

• Removes the healthcheck check for UAT traffic being received
• Creates a new service that does the same thing, and will log to stdout if there is hasn't been any traffic received

The impetus for this change is that dump978 will flag itself as unhealthy if there is no UAT traffic received. However, UAT traffic is so sporadic, and there are significant times of the day when you won't reasonably expect to get it (over-night for example), and on bad weather days when the small planes aren't flying.

Being marked as unhealthy could cause unnecessary restarts of the container if autoheal is being used, and if that's occurring then things like autogain runs will be messed up. I think it's a better option to just log out if there is no traffic received and let the user decide if it's a real issue.

Potential changes to this:

• Increase the check interval from 15 minutes to perhaps a few hours
• Consider time of day when deciding to log out