Disable native mDNS stacks and use goello as much as possible

[dubo-dubon-duponey]

Task list:

• [x] shairport
• [x] librespot
• [x] roon?
• [x] review snapcast

[dubo-dubon-duponey]

Roon uses its own flavor of multicast (that dumbly enough does not carry over vlan).

[dubo-dubon-duponey]

librespot mDNS stack cannot be disabled (only can choose between internal and with-dns-sd which implies avahi). At least it's not using avahi.

[dubo-dubon-duponey]

should be possible with shairport by not passing --with-tiny, and possibly with snapcast by removing avahi

[dubo-dubon-duponey]

shairport-sync refuses to start with mDNS not built in - tiny is the only way to go

[dubo-dubon-duponey]

librespot does disable the http auth endpoint if "disable discovery".

Closing this.