Use pkg/reuseport when listening.

(It does not compile yet
Waiting for coredns#3455
to add go.mod/sum changes)

Signed-off-by: Gonzalo Paniagua Javier <gonzalo.mono@gmail.com>

plugin/pprof/pprof.go

@@ -3,11 +3,12 @@
 package pprof
 
 import (
-	reuse "github.com/libp2p/go-reuseport"
 	"net"
 	"net/http"
 	pp "net/http/pprof"
 	"runtime"
+
+	"github.com/coredns/coredns/plugin/pkg/reuseport"
 )
 
 type handler struct {
@@ -21,7 +22,7 @@ func (h *handler) Startup() error {
 	// Reloading the plugin without changing the listening address results
 	// in an error unless we reuse the port because Startup is called for
 	// new handlers before Shutdown is called for the old ones.
-	ln, err := reuse.Listen("tcp", h.addr)
+	ln, err := reuseport.Listen("tcp", h.addr)
 	if err != nil {
 		log.Errorf("Failed to start pprof handler: %s", err)
 		return err