Fix mac check issue for vitual tunnel interface with no mac address
Fix mac check issue for vitual tunnel interface with no mac address

Change-Id: I6ce21317fcaa25781199f4329be815f076ab8b09
Signed-off-by: Hongjun Ni <e6547d24d7149371d2bb4b8f7cc3ef66745c46d6@intel.com>

chrisy/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp