- Add onewg VPN admin tool
- Add Service::WireGuard feature to VR
- Adjust Service::Failover accordingly
- Add basic JSON schema validation

Configuration (server-side) is stored in virtual router VMs using:

- ONEAPP_VNF_WG_SERVER wg0.conf file base64 encoded
- ONEAPP_VNF_WG_SERVER_TIMESTAMP when file was generated

Virtual router will reuse this configuration if present in any of the
virtual router VMs.

State is managed through onegate, thus required to run the WG service