fix the route issue when link alias has the same prefix
fix the route issue when link alias has the same prefix

soumentrivedi/haproxy,petchat/haproxy,bing6/haproxy,RoyZeng/haproxy,ytc301/haproxy-1,rogervaas/haproxy,mehulsbhatt/haproxy-1,sandcastle/haproxy,soumentrivedi/haproxy,DonSchenck/haproxy,kevinsimper/haproxy,DonSchenck/haproxy,kevinsimper/haproxy,sandcastle/haproxy,ytc301/haproxy-1,bing6/haproxy,mehulsbhatt/haproxy-1,petchat/haproxy,rogervaas/haproxy,secondrotation/haproxy,RoyZeng/haproxy,secondrotation/haproxy