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Packages `app/appdisc` and `servicedisc` both make use of service discovery (SD). Appdisc implements advertising apps (i.e. writing) (but also visor as a public service) in SD, while servicedisc implements fetching...

Currently, hypervisor tests instantiate a hypervisor without a visor: [hypervisor_test.go](https://github.com/skycoin/skywire/blob/develop/pkg/visor/hypervisor_test.go#L75) hypervisor code handles this case in some methods: [hypervisor.go]( https://github.com/skycoin/skywire/blob/develop/pkg/visor/hypervisor.go#L124) So we end up in a situation when applicaton code...