app/testpmd: fix flow director endianness

app/testpmd: fix flow director endianness

The vlan mask and tunnel id mask of flow director are defined as big
endian. So they should be converted.
When the mask is printed, the parameters are not converted either.
This patch converts the mask parameters.

Fixes: 7c554b4f0484 ("app/testpmd: update display of flow director information")
Fixes: 53b2bb9b7ea7 ("app/testpmd: new flow director commands")

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>