Merge pull request #6938 from opensourcerouting/bgp-instance-shutdown

bgpd: BGP instance administrative shutdown

diff --cc bgpd/bgp_fsm.c
Simple merge

diff --cc bgpd/bgp_packet.c
Simple merge

diff --cc bgpd/bgp_vty.c
Simple merge

diff --cc bgpd/bgpd.c
Simple merge