libgdm: drop support for serializing multiple opens

Right now libgdm tries to handle multiple simultaneous
open calls at the same time by serializing the requests
and giving them all the same connection.  It's broken,
though.

  - The pending_opens list is never populated, so we
    end up just doing multiple simultaneous open
    operations at a time anyway.
  - The finish code ends up calling
    g_task_return_error (task, NULL) instead of
    g_task_return_pointer in the non-error case.

Since the feature doesn't work, drop it for now.

https://bugzilla.gnome.org/show_bug.cgi?id=795940

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