Ticket #47960 - cookie_change_info returns random negative number if there was no change in a tree
    
    Description: An additional fix for the type mismatch for the change
    numbers.  Change Number is declared as "unsigned long" in the Retro
    Changelog plugin, while cookie_change_info in the Content Sync plugin
    is "int", which could end up with a negative number when the change
    number passes (2^31 - 1).
    
    Changing the type of cookie_change_info to "unsigned long".
    
    https://fedorahosted.org/389/ticket/47960
    
    Reviewed by rmeggins@redhat.com and tbordaz@redhat.com (Thank you,
    Rich and Thierry!!)