Add failing test reproducing issue #1015.

There is a race condition when connect and bind on a new inproc
endpoint happen "simultaneously" in threads.  Causes the error:
  Assertion failed: ok (ctx.cpp:474)

This is a backport of libzmq:5cf74db6b
by Joe Eli McIlvain <joe.eli.mac@gmail.com>
Fix race condition in connecting inproc sockets

This is a backport of libzmq:3678c32b9
by Martin Hurton <hurtonm@gmail.com>
Merge pull request #81 from olafmandel/issue_1015

Backport of test and fix for zeromq/libzmq#1015
Updated NEWS
Updated for #1015
Merge pull request #82 from hintjens/master

Updated NEWS
Merge branch 'master' of https://github.com/zeromq/zeromq4-x
Revert "Backported jemc/libzmq@5cf74db (Failing test reproducing issue #1015)"

Fixed in upstream

This reverts commit 9eeceaf0d54882be1bc81bdb179b04fde6574128.