modules/network: remove wireguard private and preshared keys
This PR removes wireguard private and preshared keys from network configuration (config example https://openwrt.org/docs/guide-user/services/vpn/wireguard/server)
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This PR removes wireguard private and preshared keys from network configuration (config example https://openwrt.org/docs/guide-user/services/vpn/wireguard/server)