Ticket 49926 - Fix replication tests on 1.3.x
    
    Description:
    nsAccount is not supported by 1.3.x branch.
    
    Fix description:
    Remove nsAccount objectClass from Replication Manager
    if DS is older than 1.4.x.
    
    https://pagure.io/389-ds-base/issue/49926
    
    Reviewed by: mreynolds, firstyear (Thanks!)