Merge pull request #14537 from opensourcerouting/feature/bgpd_aod

bgpd: Implement EBGP-OAD peering type

diff --cc bgpd/bgp_attr.c
Simple merge

diff --cc bgpd/bgp_route.c
Simple merge

diff --cc bgpd/bgp_vty.c
Simple merge

diff --cc bgpd/bgpd.c
Simple merge

diff --cc bgpd/bgpd.h
Simple merge

diff --cc doc/user/bgp.rst
Simple merge