- Remove some horrible code that faked a "struct addrinfo" to be
later passed to freeaddrinfo(). Instead, add a new group type
"GT_DEFAULT" used to denote that the filesystem is exported to the
world, and treat this case separately.
- Don't clear the AI_CANONNAME flag in a struct addrinfo returned
by getaddrinfo. There's still a bit more struct addrinfo abuse
left in here.
- Simplify do_mount() slightly by using an addrinfo pointer to keep
track of the current address.
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