test: wal_off/iterator_lt_gt is flaky

[rtsisyk]

[030] --- wal_off/iterator_lt_gt.result	Tue May 23 07:40:43 2017
[030] +++ wal_off/iterator_lt_gt.reject	Wed Jun 21 19:31:29 2017
[030] @@ -79,7 +79,8 @@
[030]  ...
[030]  too_longs
[030]  ---
[030] -- []
[030] +- - 'Some of the iterators takes too long to position: 0.054707999999991'
[030] +  - 'Some of the iterators takes too long to position: 0.128248'
[030]  ...
[030]  s:drop()
[030]  ---

[locker]

Temporarily disabled by commit 962c2caecaaa51eb91c877ae6728d735f3ccedf3 so as not to block parallel test-run.

[Totktonada]

I think we need to setup separate pipeline on separate machines for such tests.