Teardown was fixed.

Author: rzharkov

src/test/isolation/specs/snapfs_get_snapshot_size.spec

@@ -1,6 +1,6 @@
 teardown {
 	select pg_remove_snapshot( ( select recent_snapshot from pg_control_snapshot() ) );
-	drop table foo;
+	DROP TABLE IF EXISTS foo;
 }
 
 session "s1"

src/test/isolation/specs/snapfs_get_snapshot_timestamp.spec

@@ -2,7 +2,7 @@
 
 teardown {
 	select pg_remove_snapshot( ( select recent_snapshot from pg_control_snapshot() ) );
-	drop table foo;
+	DROP TABLE IF EXISTS foo;
 }
 
 session "s1"

src/test/isolation/specs/snapfs_set_backend_snapshot_sequence.spec

@@ -8,7 +8,7 @@ setup {
 teardown {
 	select pg_set_backend_snapshot( 0 );
 	select pg_remove_snapshot( ( select recent_snapshot from pg_control_snapshot() ) );
-	drop sequence seq1;
+	DROP SEQUENCE IF EXISTS seq1;
 }
 
 session "s1"