ci: respdiff - use ipv4, increase timeout, collect kresd.log

ci/respdiff/kresd.config

 -- Refer to manual: https://knot-resolver.readthedocs.io/en/latest/daemon.html#configuration
 -- Listen on localhost and external interface
 net.listen('127.0.0.1', 5353)
-net.listen('::1', 5353)
 net.listen('127.0.0.1', 8853, { tls = true })
-net.listen('::1', 8853, { tls = true })
+net.ipv6=false
 
 -- Auto-maintain root TA
 trust_anchors.file = '.local/etc/knot-resolver/root.keys'
@@ -22,4 +21,4 @@ modules = {
 	'stats',    -- Track internal statistics
 }
 
-verbose(false)
+verbose(true)