nat: revert 'fix byte order on ipfix message fields'
nat: revert 'fix byte order on ipfix message fields'

This reverts commit bfba2d555331ce67f707e608877e96dbd2aacd80.

Reason for revert: breaks test test_nat44.TestNAT44.test_ipfix_max_sessions

Change-Id: I6eed4d02835ab792e7e3491fc14240cc88a86710
Type: fix
Signed-off-by: Damjan Marion <9141bba8b2efed526e55cf796d48631af330ad98@cisco.com>

FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp