With the cilium_bgp_neighbors parameter it is possible to define
multiple BGP peer ASN & address pairs for Cilium.
Sample:
```
cilium_bgp_neighbors:
- peer_address: 192.168.128.10
peer_asn: 64512
- peer_address: 192.168.128.11
peer_asn: 64512
- peer_address: 192.168.128.12
peer_asn: 64512
```
It is possible to merge further lists with cilium_bgp_neighbors__*
parameters.
Sample:
```
cilium_bgp_neighbors__extra:
- peer_address: 192.168.128.10
peer_asn: 64512
cilium_bgp_neighbors:
- peer_address: 192.168.128.11
peer_asn: 64512
- peer_address: 192.168.128.12
peer_asn: 64512
```
This will result in the following list of BGP peer ASN & address pairs:
```
- peer_address: 192.168.128.10
peer_asn: 64512
- peer_address: 192.168.128.11
peer_asn: 64512
- peer_address: 192.168.128.12
peer_asn: 64512
```
Signed-off-by: Christian Berendt <berendt@osism.tech>