Consul deregistration using hosted service

[muphblu]

Adds automatic consul deregistration.

Works only for graceful shutdown, otherwise service will become critical and will be deregistered by consul after DeregisterCriticalServiceAfter, there is extension for manual deregistration.

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JFYI dotnet, docker and consul configs to manage consul deregistration:

• docker stop_grace_period
• dotnet shutdowntimeout
• consul check interval
• consul failuresbeforecritical
• consul deregistercriticalserviceafter