added unittest for l2info extended communities
added unittest for l2info extended communities

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