Disable autovacuum for tables in stats import tests.

While we haven't observed any test instability, it seems like a good
idea to disable autovacuum during the stats import tests.

Author: Corey Huinker
Discussion: https://postgr.es/m/CADkLM=fajh1Lpcyr_XsMmq-9Z=SGk-u+_Zeac7Pt0RAN3uiVCg@mail.gmail.com

Author: jeff-davis

src/test/regress/expected/stats_import.out

@@ -11,7 +11,7 @@ CREATE TABLE stats_import.test(
     comp stats_import.complex_type,
     arange int4range,
     tags text[]
-);
+) WITH (autovacuum_enabled = false);
 -- starting stats
 SELECT relpages, reltuples, relallvisible
 FROM pg_class
@@ -139,7 +139,8 @@ DETAIL:  This operation is not supported for views.
 CREATE TABLE stats_import.part_parent ( i integer ) PARTITION BY RANGE(i);
 CREATE TABLE stats_import.part_child_1
   PARTITION OF stats_import.part_parent
-  FOR VALUES FROM (0) TO (10);
+  FOR VALUES FROM (0) TO (10)
+  WITH (autovacuum_enabled = false);
 ANALYZE stats_import.part_parent;
 SELECT relpages
 FROM pg_class

src/test/regress/sql/stats_import.sql

@@ -13,7 +13,7 @@ CREATE TABLE stats_import.test(
     comp stats_import.complex_type,
     arange int4range,
     tags text[]
-);
+) WITH (autovacuum_enabled = false);
 
 -- starting stats
 SELECT relpages, reltuples, relallvisible
@@ -99,7 +99,8 @@ SELECT
 CREATE TABLE stats_import.part_parent ( i integer ) PARTITION BY RANGE(i);
 CREATE TABLE stats_import.part_child_1
   PARTITION OF stats_import.part_parent
-  FOR VALUES FROM (0) TO (10);
+  FOR VALUES FROM (0) TO (10)
+  WITH (autovacuum_enabled = false);
 
 ANALYZE stats_import.part_parent;