test: fix flaky vinyl-040-utubettl.t

The sleep time in the test is equal to ttr time for a task. It can
lead to the false-negative result considering that unreleased tasks
are updated in a separate fiber. So we need to wait a little
longer to avoid it.

Closes #194

Author: oleg-jukovec

t/040-utubettl.t

@@ -91,7 +91,7 @@ test:test('ttr put/take', function(test)
     local my_queue = queue.create_tube('trr_test', 'utubettl', { engine = engine })
     test:ok(my_queue:put('ttr1', { ttr = 1 }), 'put ttr task')
     test:ok(my_queue:take(0.1) ~= nil, 'take this task')
-    fiber.sleep(1)
+    fiber.sleep(1.1)
     local task = my_queue:peek(0)
     test:is(task[2], state.READY, 'Ready state returned after one second')
 end)