Ticket 49313 - Change the retrochangelog default cache size
    
    Bug Description:
        Default retroCL backend entry cache size is 2Mb.
        It has been reported in many deployments that DB corruption could
        be prevented by increasing entry cache to 200Mb.
        There is no identified reproducible steps to debug this DB corruption.
        So to prevent this problem we are increasing the entry cache
    
    Fix Description:
        Set default cn=changelog cache to 200Mb (based on production cases)
        An other option would be to set a maximum number of entries but
        as we do not know if it works to prevent DB corruption, let's prefere
        entry cache size
    
    https://pagure.io/389-ds-base/issue/49313
    
    Reviewed by: William Brown
    
    Platforms tested: F23
    
    Flag Day: no
    
    Doc impact: no