Fix the Most recent Addition/Erase date are not matched between in-band and
out-band.
ipmitool SDR code doesn't have to check for valid date to print
based on 'Delete SDR command supported' and 'Partial Add SDR command
supported', if 0xffffffff is taken. Also 'Timestamp' data type needs to change
to time_t(long) because same data type is using for gmtime(time_t) API, it has
different behaviour for Linux and Windows C.