Issue 51095 - abort operation if CSN can not be generated
    
    Bug Description:  If we fail to get the system time then we were using an
                      uninitialized timespec struct which could lead to bizarre
                      times in CSN's.
    
    Fix description:  Check if the system time function fails, and if it does
                      then abort the update operation.
    
    relates: https://pagure.io/389-ds-base/issue/51095
    
    Reviewed by: firstyear & tbordaz(Thanks!!)