proxy forgets queued messages before debugee connects, when luade-bug listens for incoming debuggee connections #344

.. at least I think it does.
So when using lua debug as a proxy waiting for a remote lua debuggee, with a config like e.g.

{
     "type": "lua",
      "request": "attach",
      "client": false,
      "address": "127.0.0.1:32000",
}

the debuggee connected to the lua-debug proxy, and then nothing happened.
I think it is due to missing code in extension/script/common/socket.lua#L88
For the other cases, when lua-debug connects to the debuggee, around line 71-75 queued messages are sent to the new connection. The equivalent is missing in lines 88 and following. Inserting lines 71-75 at line 88, leads to the behavior I expect for my debuggee, but I'm not entirely sure this the correct behavior in general?