Client crash when using protobuf3.1

[gitgoready]

compile proto files("syntax=proto3") using protobuf3.1，server run ok and got client request，client crash with Application_error(0)

[gitgoready]

Acturely it's rpc_response_header_status_code_INACTIVE in rpc_channel_impl::handle_client_response

[gitgoready]

Ok,it's an proto2 to proto3 error, enum default value are set to the first one, zero now. change rpcz.proto to
message rpc_response_header {
enum status_code {
OK = 0; // Done
ACTIVE = 1;
INACTIVE = 2;

and class connection_manager enum definition to
class connection_manager {
public:
enum status {
DONE = 0,
INACTIVE = 1,
ACTIVE = 2,

recompile and proto3 ok now.