Write peer config to secret

[paddyoneill]

Update controller to write peer configs to a secret named <wireguard>-peer-configs. Each peer config is stored as a key / value pair using the peer's name as the key.

$ kubectl get secret/test-vpn-peer-configs -o jsonpath='{.data.my-peer}' | base64 -d

[Interface]
PrivateKey = ...
Address = 10.8.0.3
DNS = 10.96.0.10, default.svc.cluster.local


[Peer]
PublicKey = RTNaw+NHkHZEMDnt65d9sKBFPuGwrnN7Oj683nqLP2s=
AllowedIPs = 10.8.0.0/24,172.16.0.0/12,192.168.101.0/24
EndPoint = 172.16.12.5:51820

Removes the config template from the wireguard peer status.