"SOA MNAME name server" should be info

[peterthomassen]

Checking domains hosted by deSEC says:

Warning
SOA MNAME name server "get.desec.io/2a01:4f8:10a:1044:deec:642:ac10:80" does not respond to an SOA query.

Warning
SOA MNAME name server "get.desec.io/88.99.64.5" does not respond to an SOA query.

While that's true, it's not a problem: The MNAME nameserver might or might not be reachable (hidden, see RFC 2136 Section 4.3). (Who knows if it's a nameserver at all.)

I'd like to suggest turning this from warning to info.

[matsduf]

To give context, "warning" in Zonemaster messges is defined as

A result at level WARNING means something that will under some circumstances be a problem, but that is unlikely to be noticed by a casual user. Problems at this level may be an extra nameserver listed at the parent side, or unsuitable time values in a SOA record.

https://github.com/zonemaster/zonemaster/blob/master/docs/public/specifications/tests/SeverityLevelDefinitions.md#warning

[peterthomassen]

The term "warning" is sufficient for large numbers of users to open support tickets, which probably is not the intention of that terminology.

[matsduf]

Also see a discussion on the message levels in #1080

[matsduf]

@peterthomassen, thank you for your comments! They are valuable.