Define 'ipv6_router_advertisement' model for Dell Enterprise SONiC collection#290

ArunSaravananBalachandran wants to merge 2 commits intoansible-network:masteransible-network/resource_module_models:masterfrom

ArunSaravananBalachandran:sonic_ipv6_rtadvArunSaravananBalachandran/resource_module_models:sonic_ipv6_rtadvCopy head branch name to clipboard