path: stop checking AS length in the AS4_PATH attribute
path: stop checking AS length in the AS4_PATH attribute

tamihiro/gobgp,fujita/gobgp,tamihiro/gobgp,Dipsingh/gobgp,ramrunner/gobgp,YujiOshima/gobgp,h-naoto/gobgp,osrg/gobgp,ishidawataru/gobgp,Dipsingh/gobgp,h-naoto/gobgp,postfix/gobgp,a16/gobgp,a16/gobgp,fujita/gobgp,tamihiro/gobgp,osrg/gobgp,j-kato/gobgp,j-kato/gobgp,fujita/gobgp,a16/gobgp,ishidawataru/gobgp,a16/gobgp,postfix/gobgp,osrg/gobgp,YujiOshima/gobgp,a16/gobgp,Dipsingh/gobgp,a16/gobgp,h-naoto/gobgp,fujita/gobgp,ramrunner/gobgp,a16/gobgp,ishidawataru/gobgp,YujiOshima/gobgp,tamihiro/gobgp,osrg/gobgp,ramrunner/gobgp,postfix/gobgp,j-kato/gobgp