add a family usage test file
add a family usage test file

earies/exabgp,dneiter/exabgp,PowerDNS/exabgp,lochiiconnectivity/exabgp,blablacar/exabgp,lochiiconnectivity/exabgp,chrisy/exabgp,blablacar/exabgp,lochiiconnectivity/exabgp,PowerDNS/exabgp,earies/exabgp,fugitifduck/exabgp,benagricola/exabgp,fugitifduck/exabgp,chrisy/exabgp,benagricola/exabgp,dneiter/exabgp,chrisy/exabgp,earies/exabgp,blablacar/exabgp,fugitifduck/exabgp,benagricola/exabgp,PowerDNS/exabgp,dneiter/exabgp