[horde] locking on horde_sessionhandler

[Gabriel Sere]

The table horde_sessionhandler is defined with InnoDB
engine. The mysql 5.0 manuals says table locking on this
kind of tables should be avoided because the locking is
automatic. Also lock this tables could introduce unexpected
and long delays on select statments.

May be the statement

$result = @mysql_query('LOCK TABLES ' . $this->_params['table'] .
	' WRITE', $this->_db);

at line 97 on file lib/Horde/SessionHandler/mysql.php should be
performed only if the table is not InnoDB.

Gabriel.