PG-260: Fix regression tests.

The regression tests required some adjustmentes as they were based on a
wrong behavior in pg_stat_monitor that was fixed in the last commits.

The problem was that pg_stat_monitor_reset() was not properly clearing
the query buffers, as such, some garbage queries were residing in the
buffers after calling pg_stat_monitor_reset().

One example of a problem, a query such as "SELECT 1 AS num" and the
same query with comments such as:
SELECT $1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3)
*/
Are evaluated to the same query ID, if a test issue the first query, call
pg_stat_monitor_reset() to clear query buffer, then issue the second
query with comments, the result in pg_stat_monitor view would still contain
the first query without comments, this was leading to tests expecting
the wrong output, which is now fixed.

regression/expected/counters.out

@@ -68,7 +68,7 @@ end $$;
 SELECT query,calls FROM pg_stat_monitor ORDER BY query COLLATE "C";
                                                query                                               | calls 
 ---------------------------------------------------------------------------------------------------+-------
- SELECT a,b,c,d FROM t1, t2, t3, t4 WHERE t1.a = t2.b AND t3.c = t4.d ORDER BY a;                  |  1000
+ SELECT a,b,c,d FROM t1, t2, t3, t4 WHERE t1.a = t2.b AND t3.c = t4.d ORDER BY a                   |  1000
  SELECT pg_stat_monitor_reset();                                                                   |     1
  SELECT query,calls FROM pg_stat_monitor ORDER BY query COLLATE "C";                               |     1
  do $$                                                                                            +|     1

regression/expected/state.out

@@ -16,7 +16,7 @@ ERROR:  division by zero
 SELECT query, state_code, state FROM pg_stat_monitor ORDER BY query COLLATE "C";
                                       query                                       | state_code |        state        
 ----------------------------------------------------------------------------------+------------+---------------------
- SELECT $1 AS num                                                                 |          3 | FINISHED
+ SELECT $1                                                                        |          3 | FINISHED
  SELECT 1/0;                                                                      |          4 | FINISHED WITH ERROR
  SELECT pg_stat_monitor_reset();                                                  |          3 | FINISHED
  SELECT query, state_code, state FROM pg_stat_monitor ORDER BY query COLLATE "C"; |          2 | ACTIVE

regression/expected/tags.out

@@ -13,8 +13,8 @@ SELECT 1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3) */;
 
 SELECT query, comments FROM pg_stat_monitor ORDER BY query COLLATE "C";
                                    query                                   |                       comments                       
--------------------------------------------------------------------------+------------------------------------------------------
+---------------------------------------------------------------------------+------------------------------------------------------
- SELECT $1 AS num                                                        |  { "application", psql_app, "real_ip", 192.168.1.3) 
+ SELECT $1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3) */ |  { "application", psql_app, "real_ip", 192.168.1.3) 
  SELECT pg_stat_monitor_reset();                                           | 
  SELECT query, comments FROM pg_stat_monitor ORDER BY query COLLATE "C";   | 
 (3 rows)