zeroconf: use DNS length field to safely skip unknown record types

hgext/zeroconf/Zeroconf.py

@@ -560,7 +560,7 b' class DNSIncoming(object):'
 				#
 				#print "UNKNOWN TYPE = " + str(info[0])
 				#raise BadTypeInNameException
-				break
+				self.offset += info[3]
 
 			if rec is not None:
 				self.answers.append(rec)