container/op: merge mqueue and dev Ops

There is no reason to mount mqueue anywhere else, and these Ops usually follow each other. This change merges them. This helps decrease IPC overhead and also enables mounting dev readonly.

Signed-off-by: Ophestra <cat@gensokyo.uk>

helper/container_test.go

@@ -33,7 +33,7 @@ func TestContainer(t *testing.T) {
 		testHelper(t, func(ctx context.Context, setOutput func(stdoutP, stderrP *io.Writer), stat bool) helper.Helper {
 			return helper.New(ctx, os.Args[0], argsWt, stat, argF, func(z *container.Container) {
 				setOutput(&z.Stdout, &z.Stderr)
-				z.Bind("/", "/", 0).Proc("/proc").Dev("/dev")
+				z.Bind("/", "/", 0).Proc("/proc").Dev("/dev", true)
 			}, nil)
 		})
 	})