l2fwd: fix isssue with setting mac age from api
l2fwd: fix isssue with setting mac age from api

Change-Id: Ib08b87ac91f78bebb539f544850b07dbf76f31f6
Signed-off-by: Damjan Marion <9141bba8b2efed526e55cf796d48631af330ad98@cisco.com>

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