With this commit the GUID encoding is now by default detected
automatically based on the validity of the version field,
and the timestamp (for time-based version 1 GUIDs).
The version is considered valid if it is 1 through 5.
The timestamp is considered valid if the year is past UNIX Epoch
and before the current year.
Resolvesipmitool/ipmitool#25
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>