Disable persistent connections

[tomjanssens]

The number of open connections keeps growing until the limit has been reached. For now, the wait_timeout has been decreased to make sure connections are being cleaned up automatically.

Todo:

• Remove the ATTR_PERSISTENT setting in DatabaseAdapterMysql where the mysql connection is being made
• Reset the server's configuration (wait_timeout + max_connections back to default)
• Follow-up. If the situation has improved, apply the same change to Nooku Platform.

See: http:https://www.percona.com/blog/2006/11/12/are-php-persistent-connections-evil/
Also see: https://groups.google.com/forum/#!topic/comp.databases.mysql/SuaL7-G0iOc