ZMQAuth is broken with czmq 3.x

[mkoppanen]

The API has changed completely and does not support libzmq sockets directly

[phuedx]

I'll look into this soon. It may result in completely extracting it, it may not.

@mkoppanen: If you wish, then you can assign this to me.

[mkoppanen]

I think it will result either in extracting or updating large other parts. zauth in CZMQ 3.x works only on "zsock_t" which is an opaque handle to zeromq sockets. I couldn't find a way to convert plain libzmq socket to that type.

One option we have is to add fuller czmq bindings alongside.