remove unnecessary code

common/net/net.go

@@ -1,4 +1,2 @@
-//go:generate protoc --go_out=. address.proto port.proto
-
 // Package net contains common network utilities.
 package net

proxy/freedom/config.go

@@ -1,3 +1 @@
-//go:generate protoc --go_out=. config.proto
-
 package freedom

proxy/http/config.go

@@ -1,3 +1 @@
-//go:generate protoc --go_out=. config.proto
-
 package http