[BUG] plugin/ready: fix Reset list of readiness plugins (#8035)

Signed-off-by: 杨军10092085 <yang.jun22@zte.com.cn>

plugin/ready/setup.go

@@ -11,6 +11,7 @@ import (
 func init() { plugin.Register("ready", setup) }
 
 func setup(c *caddy.Controller) error {
+	plugins.Reset()
 	addr, monType, err := parse(c)
 	if err != nil {
 		return plugin.Error("ready", err)
@@ -32,7 +33,6 @@ func setup(c *caddy.Controller) error {
 	c.OnRestartFailed(func() error { return uniqAddr.ForEach() })
 
 	c.OnStartup(func() error {
-		plugins.Reset()
 		for _, p := range dnsserver.GetConfig(c).Handlers() {
 			if r, ok := p.(Readiness); ok {
 				plugins.Append(r, p.Name())