topotests: add bgp_vpnv6 test allocation

This test demonstrates that a label is allocated for each
ipv6 next-hop. IPv6 test introduces link local ipv6 addresses
as next hops, and compared to IPv4, one can have two different
next-hops depending if the next-hop is defined by a global
address (static route redistributed) or a bgp peer.

This test checks that:
- The labels are correctly allocated per connected next-hop.
- The default label is used for non connected prefixes.
- The withdraw operation frees the MPLS entry.
- If a recursive route is redistributed by BGP, then the nexthop
tracking will find the appropriate nexthop entry, and the
associated label will be found out.
- When a prefix moves from one peer to one another behind the
vrf, then the MPLS switching operation for return
traffic is changing the outgoing interface to use.
- When the 'label vpn export <value>' MPLS label value is changed,
then the modification is propagated to prefixes which use that value.
- Also, when unconfiguring the per-nexthop allocation mode, check
that the MPLS entries and the VPNv4 entries of r1 are changed
accordingly.
- Reversely, when re-configuring the per-nexthop allocation mode,
check that the allocation mode reuses the other label values.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

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