Bug 668619 - slapd stops responding
    
    https://bugzilla.redhat.com/show_bug.cgi?id=668619
    
    Description: The server uses c_timelimit field in the connection
    table element to check the staled Simple Paged Results request.
    The field is supposed to be cleaned up when the staled Simple
    Paged Results connection is disconnected.  But the cleanup was
    sometimes incomplete.  It causes the following requests which
    happens to acquire the same connection table element timed out.
    This patch forces to clean up the c_timelimit every time the
    connection table is acquired and renewed.  Also, the timeout
    check is done only for the Simple Paged Results connection.