Code review comment for lp:~alan-griffiths/mir/make-endpoint-accessible-option

I'm somewhat hesitant to introduce this; it's somewhat of a workaround for us not being able to run Mir in a window in X, which it looks like Cemil is actually going to do soon.

If we are going to introduce it, I think it should be as minimal as possible. I'd prefer “make utterly insecure socket” over “set security for socket”.