config: Added a gateway server address

config/config.go

@@ -40,8 +40,9 @@ type Datastore struct {
 
 // Addresses stores the (string) multiaddr addresses for the node.
 type Addresses struct {
-	Swarm []string // addresses for the swarm network
-	API   string   // address for the local API (RPC)
+	Swarm   []string // addresses for the swarm network
+	API     string   // address for the local API (RPC)
+	Gateway string   // address to listen on for IPFS HTTP object gateway
 }
 
 // Mounts stores the (string) mount points