NAT44: fix static mapping for DHCP addressed interface deleting (VPP-1223)
NAT44: fix static mapping for DHCP addressed interface deleting (VPP-1223)

Change-Id: Ifb4d23059b7989c32a52eaf0c25c275b35e83010
Signed-off-by: Matus Fabian <fce541bb5d92358522a3d9dac9c8f88030b6f773@cisco.com>

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