See ticket #2366 for details.
Okayed by muks on jabber.
Note that no test checked this and I don't introduce any test
since I am pretty sure this code will no exist in any production
version of a resolver (since won't limit IN only).
a negative retry count: only zero or positive values are valid. The
configuration update was abandoned and the parameters were not changed.
-% RESOLVER_NON_IN_PACKET non-IN class request received, returning REFUSED message
+% RESOLVER_NON_IN_PACKET non-IN class (%1) request received, returning REFUSED message
This debug message is issued when resolver has received a DNS packet that
was not IN (Internet) class. The resolver cannot handle such packets,
so is returning a REFUSED response to the sender.