When shutting down an implicit service, we should always shutdown if there are no other steampipe clients connected to it.

[binaek]

Right now, when a steampipe command is exiting, it doesn't shutdown the service if there are other clients connected to it. This is to prevent the other clients from losing connection.

However, if the aforementioned "other client" is a non-steampipe executable, that will not stop the service and this will keep the service hanging around and will also prevent the next steampipe service start since postgres does not allow updates to listen_addresses while it is running.