Use HTTP2MatchHeaderFieldSendSettings for incoming gRPC connections

gRPC clients which wait until they receive a `SETTINGS` frame may not be
able to connect to CRI-O because of a limitation to cmux:
- https://github.com/soheilhy/cmux#limitations

The issue seems not yet solved and causes impossible connection when
upgrading cri-tools to the latest version of gRPC. A possible workaround
is to export the environment variable: `GRPC_GO_REQUIRE_HANDSHAKE=off`.

Reference: grpc/grpc-go#2636

Signed-off-by: Sascha Grunert <[email protected]>

cmd/crio/main.go

@@ -632,7 +632,7 @@ func main() {
 		}
 
 		m := cmux.New(lis)
-		grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
+		grpcL := m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc"))
 		httpL := m.Match(cmux.HTTP1Fast())
 
 		infoMux := service.GetInfoMux()