unbound: Refresh manpages to latest version

Update unbound manpages by copying the current unbound manpages in
contrib/doc/*.in to their respective manpages,

PR: 262013
Reported by: Michael Osipov <michael.osipov@siemens.com>
Fixes: numerous previous updates
MFC after: 3 days

Import unblock-lan-zones feature backported from upstream svn trunk.
This is a partial fix for reverse lookups in RFC 1918 networks. With
this option enabled, unbound no longer ignores these queries; however,
it will still reject the answer it gets from the forwarder, because
the RFC 1918 reverse zones are signed.

Submitted by: "W.C.A. Wijngaards" <wouter@nlnetlabs.nl>

Regenerate

Approved by: re (blanket)

Generated configuration and documentation

Approved by: re (blanket)