[PATCH] test: fix vinyl/errinj failure

[Vladimir Davydov]

On Fri, Mar 15, 2019 at 07:25:46PM +0300, Vladimir Davydov wrote:
> The patch fixes the following test failure:
> 
>  | --- vinyl/errinj.result Fri Mar 15 19:19:19 2019
>  | +++ vinyl/errinj.reject Fri Mar 15 19:21:37 2019
>  | @@ -854,7 +854,8 @@
>  |  ...
>  |  ret
>  |  ---
>  | -- - [3, 3]
>  | +- - [2, 2]
>  | +  - [3, 3]
>  |  ...
>  |  s:drop()
>  |  ---
> 
> The error occurrs, because the test doesn't make sure that a read from
> the scondary index actually occurs and the fiber does stall on a read
> from the primary index. Use index stats to assure that.
> 
> Closes #3863
> ---
>  test/vinyl/errinj.result   | 25 +++++++++++++++++++------
>  test/vinyl/errinj.test.lua | 11 +++++++----
>  2 files changed, 26 insertions(+), 10 deletions(-)

Trivial. Pushed to 2.1.