Add gogoproto option to generate compare method (#62)

Author: kyessenov

proxy/v1/config/cfg.proto

@@ -47,11 +47,14 @@
 
 syntax = "proto3";
 
+package istio.proxy.v1alpha.config;
+
 import "google/protobuf/any.proto";
 import "google/protobuf/wrappers.proto";
+import "gogoproto/gogo.proto";
 
-package istio.proxy.v1alpha.config;
 option go_package = "config";
+option (gogoproto.compare_all) = true;
 
 ///@exclude Proxy level global configurations go here
 message ProxyMeshConfig {