bgpd: Add `neighbor soo` command

BGP SoO is a tag that is appended on BGP updates to allow a peer to mark
a particular peer as belonging to a particular site. In certain MPLS L3 VPN
configurations, the BGP AS-Path may not provide the granularity needed
prevent a loop in the control-plane. With this in mind, BGP SoO is designed
to fill this gap and prevent a routing loop that may occur.

If we configure for example, `neighbor soo 65000:1` at PEs, routes won't be
announced between CPEs if soo matches. This is especially needed when using
as-override or allowas-in.

Also, this is the automated way of the same behavior as configuring route-maps
for each peer like:

```
bgp extcommunity-list cpe permit soo 65000:1
!
route-map cpe permit 10
 set extcommunity soo 65000:1
...
route-map cpe deny 10
 match extcommunity cpe
route-map cpe permit 20
...
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

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