Re: GUC for cleanup indexes threshold.

Hi, I tried regression test and found some errors concerning brin and gin,
though I didn't look into this.

Here's a log:

*** /home/ideriha/postgres-master/src/test/regress/expected/brin.out	2017-02-13 11:33:43.270942937 +0900
--- /home/ideriha/postgres-master/src/test/regress/results/brin.out	2017-02-15 14:58:24.725984474 +0900
***************
*** 403,408 ****
  SELECT brin_summarize_new_values('brinidx'); -- ok, no change expected
   brin_summarize_new_values 
  ---------------------------
!                          0
  (1 row)
  
--- 403,408 ----
  SELECT brin_summarize_new_values('brinidx'); -- ok, no change expected
   brin_summarize_new_values 
  ---------------------------
!                          5
  (1 row)
  

======================================================================

*** /home/ideriha/postgres-master/src/test/regress/expected/gin.out	2016-12-20 16:49:09.513050050 +0900
--- /home/ideriha/postgres-master/src/test/regress/results/gin.out	2017-02-15 14:58:25.536984461 +0900
***************
*** 20,26 ****
  select gin_clean_pending_list('gin_test_idx'); -- nothing to flush
   gin_clean_pending_list 
  ------------------------
!                       0
  (1 row)
  
  -- Test vacuuming
--- 20,26 ----
  select gin_clean_pending_list('gin_test_idx'); -- nothing to flush
   gin_clean_pending_list 
  ------------------------
!                       8
  (1 row)
  
  -- Test vacuuming

======================================================================


Regards,
Ideriha Takeshi