[docker-fpm-frr]: Enable sending ipv6 prefixes over ipv4 BGPMON session#3799

lguohan merged 2 commits intosonic-net:mastersonic-net/sonic-buildimage:masterfrom

pavel-shirshov:pavelsh/bgpmon_ipv6pavel-shirshov/sonic-buildimage:pavelsh/bgpmon_ipv6Copy head branch name to clipboard