cmd/cli: fix wrong generated config for nextdns resolver

Generating nextdns config must happen after stopping current ctrld
process. Otherwise, config processing may pick wrong IP+Port.

While at it, also making logging better when updating listener config:

 - Change warn to info, prevent confusing that "something is wrong".
 - Do not emit info when generating working default config, which may
   cause duplicated messages printed.

cmd/cli/prog.go

@@ -135,7 +135,7 @@ func (p *prog) runWait() {
 
 		waitOldRunDone()
 
-		_, ok := tryUpdateListenerConfig(newCfg, false)
+		_, ok := tryUpdateListenerConfig(newCfg, nil, false)
 		if !ok {
 			logger.Error().Msg("could not update listener config")
 			continue