Fix link down issue of vxlan-gpe interface
Fix link down issue of vxlan-gpe interface

Change-Id: Iaf72e7ffb2d30799733f641d66bbc74f40a4d6e1
Signed-off-by: Hongjun Ni <e6547d24d7149371d2bb4b8f7cc3ef66745c46d6@intel.com>

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