Changed key of NSH VXLAN tunnel.
Changed key of NSH VXLAN tunnel.

- simple patch before extending CLI for next encap tunnel lookup

Change-Id: I56060185599252a1ae83cc162963b5fd5bc1b324
Signed-off-by: Keith Burns (alagalah) <469d26a9115c63bc10d4323e29088530ee1e798d@gmail.com>

FDio/vpp,muharif/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,chrisy/vpp,milanlenco/vpp,chrisy/vpp,vpp-dev/vpp,milanlenco/vpp,vpp-dev/vpp,muharif/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,milanlenco/vpp,chrisy/vpp,FDio/vpp,muharif/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,vpp-dev/vpp,chrisy/vpp,muharif/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,FDio/vpp,vpp-dev/vpp,milanlenco/vpp,muharif/vpp,muharif/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,vpp-dev/vpp,milanlenco/vpp,FDio/vpp