Ticket 49631 - same csn generated twice
    
    Bug: if in the csn adjustment the local time was less or equal than the remote time
         the sequence number has always been adjusted to remote++
         but if the csn time was equal and the local seq number was larger the effect
         was a reset of the csn generato.
    
    Fix: correctly handles seqnum in csn adjustment
    
    https://pagure.io/389-ds-base/issue/49631
    
    Reviewed by: Mark, thanks