nat: fix extended unit tests
nat: fix extended unit tests

Type: fix
Fixes: b86437b79b82493c2e9728929df417f55b153824

Signed-off-by: Klement Sekera <b8003f27414ca85c37624503b7b4e8f8c829bb4d@cisco.com>
Change-Id: I2c833928dcdceb4d23dfc161bcc3358272076980

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