[relay] Improve relay messages (#2574)

Co-authored-by: Zoltán Papp <zoltan.pmail@gmail.com>

relay/auth/allow/allow_all.go

@@ -1,12 +1,14 @@
 package allow
 
-import "hash"
-
 // Auth is a Validator that allows all connections.
 // Used this for testing purposes only.
 type Auth struct {
 }
 
-func (a *Auth) Validate(func() hash.Hash, any) error {
+func (a *Auth) Validate(any) error {
+	return nil
+}
+
+func (a *Auth) ValidateHelloMsgType(any) error {
 	return nil
 }