By default, only first 3 bytes of GRE key will be used for hash or
FD calculation. With these changes, it can select 3 or 4 bytes of
GRE key for hash or FD calculation.
Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Signed-off-by: Andrey Chilikin <andrey.chilikin@intel.com>