p2p: flags never work in config file

Author: cuiweixie

p2p/config.go

@@ -53,11 +53,11 @@ type Config struct {
 	NoDiscovery bool
 
 	// DiscoveryV4 specifies whether V4 discovery should be started.
-	DiscoveryV4 bool `toml:",omitempty"`
+	DiscoveryV4 bool `toml:"-"`
 
 	// DiscoveryV5 specifies whether the new topic-discovery based V5 discovery
 	// protocol should be started or not.
-	DiscoveryV5 bool `toml:",omitempty"`
+	DiscoveryV5 bool `toml:"-"`
 
 	// Name sets the node name of this server.
 	Name string `toml:"-"`