making proto files v3 compatible

lib/latency-format.proto

+syntax = "proto2";
+
 package transport.latency.format;
 
 message LatencyDist

lib/tests/simtransport-testmessage.proto

+syntax = "proto2";
+
 package transport.test;
 
 message TestMessage {

lockserver/locks-proto.proto

+syntax = "proto2";
+
 package lockserver.proto;
 
 message Request {

replication/common/request.proto

+syntax = "proto2";
+
 package replication;
 
 message Request {

replication/ir/ir-proto.proto

+syntax = "proto2";
+
 import "replication/common/request.proto";
 
 package replication.ir.proto;

replication/vr/vr-proto.proto

+syntax = "proto2";
+
 import "replication/common/request.proto";
 
 package replication.vr.proto;

store/common/common-proto.proto

+syntax = "proto2";
+
 message TimestampMessage {
     required uint64 id = 1;
     required uint64 timestamp = 2;

store/strongstore/strong-proto.proto

+syntax = "proto2";
+
 import "store/common/common-proto.proto";
 
 package strongstore.proto;

store/tapirstore/tapir-proto.proto

+syntax = "proto2";
+
 import "store/common/common-proto.proto";
 
 package tapirstore.proto;

store/weakstore/weak-proto.proto

+syntax = "proto2";
+
 package weakstore.proto;
 
 message ReplyMessage {
@@ -27,4 +29,4 @@ message PutMessage {
 
 message PutReplyMessage {
     required int32 status = 1;
-}
\ No newline at end of file
+}

test-client/test-client-proto.proto

+syntax = "proto2";
+
 message TestMessage {
     required int32 status = 1;
 }