Ticket 47495 - admin express: wrong instance creation time
    
    Bug Description:  Admin express attempted to convert a gmtime value
                      as if it was in the format: YYYYmmddHHMMSS
    
                      This gave the wrong value in Admin Express.
    
    Fix Description:  Propeperly convert gmtime - reused the same functions
                      389-ds-base uses to convert a gmtime to a nice string.
    
    https://fedorahosted.org/389/ticket/47495
    
    Reviewed by: nhosoi(Thanks!)