[PATCH] test: don't leave open read views after vinyl/iterator

[Vladimir Davydov]

On Fri, Mar 15, 2019 at 05:09:03PM +0300, Vladimir Davydov wrote:
> An open iterator may disrupt the following test run, because it may
> prevent dump/compaction from purging stale rows. In particular,
> iterators left by vinyl/iterator result in the following test failure:
> 
>  | --- vinyl/deferred_delete.result        Mon Feb 11 19:14:01 2019
>  | +++ vinyl/deferred_delete.reject        Fri Mar 15 16:21:11 2019
>  | @@ -155,7 +155,7 @@
>  |  ...
>  |  pk:stat().rows -- 5 new REPLACEs
>  |  ---
>  | -- 5
>  | +- 10
>  |  ...
>  |  i1:stat().rows -- 10 old REPLACE + 5 new REPLACEs + 10 deferred DELETEs
>  |  ---
> 
> Fix this by calling the Lua garbage collector to delete all dangling
> iterators in the end of vinyl/iterator test.
> 
> Closes #3862
> ---
> https://github.com/tarantool/tarantool/issues/3862
> 
>  test/vinyl/iterator.result   | 13 +++++++++++++
>  test/vinyl/iterator.test.lua |  6 ++++++
>  2 files changed, 19 insertions(+)

Trivial. Pushed to 2.1.