Merge pull request #12646 from pguibert6WIND/mpls_alloc_per_nh

MPLS allocation mode per next hop

diff --cc bgpd/bgp_labelpool.c
Simple merge

diff --cc bgpd/bgp_labelpool.h
Simple merge

diff --cc bgpd/bgp_mplsvpn.c
Simple merge

diff --cc bgpd/bgp_nexthop.c
Simple merge

diff --cc bgpd/bgp_nht.c
Simple merge

diff --cc bgpd/bgp_route.c
Simple merge

diff --cc bgpd/bgp_route.h
Simple merge

diff --cc bgpd/bgp_vty.c
Simple merge

diff --cc bgpd/bgp_zebra.c
Simple merge

diff --cc bgpd/bgp_zebra.h
Simple merge

diff --cc bgpd/bgpd.c
Simple merge

diff --cc bgpd/bgpd.h
Simple merge

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

diff --cc zebra/zebra_mpls.c
Simple merge