[ticket/12570] Add test for updating a config with the same value

PHPBB3-12570
[ticket/12570] Add a unit test to show broken sql_affectedrows()

PHPBB3-12570
[ticket/12570] Fix MySQLi affectedrows by specifying MYSQLI_CLIENT_FOUND_ROWS

PHPBB3-12570
[ticket/12570] Fix MySQL affectedrows

We always want the number of matched rows instead of changed rows,
when running an update. So when mysql_info() returns the number of
matched rows we return that one instead of mysql_affected_rows()

PHPBB3-12570
[ticket/12570] Add a test for set_array() and updating with the same value

PHPBB3-12570
[ticket/12570] Remove test for affected rows after SELECT

It's not supposed to work

PHPBB3-12570
Merge pull request #2492 from nickvergessen/ticket/12570

[ticket/12570] Fix updating a config with the same value

* nickvergessen/ticket/12570:
  [ticket/12570] Remove test for affected rows after SELECT
  [ticket/12570] Add a test for set_array() and updating with the same value
  [ticket/12570] Fix MySQL affectedrows
  [ticket/12570] Fix MySQLi affectedrows by specifying MYSQLI_CLIENT_FOUND_ROWS
  [ticket/12570] Add a unit test to show broken sql_affectedrows()
  [ticket/12570] Add test for updating a config with the same value