FAB-16269 remove unused imports and regen protos

Change-Id: I8e516bc8d3bcc7dde3b0bf71dfb2f5a5f85f09c2
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>

Author: sykesm

protos/discovery/protocol.pb.go

@@ -6,7 +6,6 @@ syntax = "proto3";
 
 import "gossip/message.proto";
 import "msp/msp_config.proto";
-import "msp/identities.proto";
 
 option go_package = "github.com/hyperledger/fabric/protos/discovery" ;