bug: second take() hangs after disconnect during take()

[Totktonada]

@Mons describes the following case when take() may hang.

Take a task from a connector (say, net.box), disconnect and connect again, try to take this task again. It is stated that the second take will (may?) hang.

It seems that something like this was fixed in xqueue here: moonlibs/xqueue@eb50150

Let's verify it, fix and cover with a test.

[LeonidVas]

Looks like it has been fixed twice in #103 and tarantool/tarantool#4627

[LeonidVas]

D'oh, I was wrong. This unrelated to #103 bug.