EDGAR healthcheck should ping Ethernet bridge

[mbfm]

EDGAR currently only pings the WireGuard IP-address. As such, it verifies that the VPN works, but cannot verify that the remaining configuration on the host works.
Instead, an IP-address should be assigned to the br-opendut bridge and this IP-address should be pinged instead.

Tasks:

• Determine IP-address for each EDGAR in CARL.
• Send IP-address via EthernetBridge-Parameter to EDGAR.
• EDGAR assigns this IP-address to the bridge.
• EDGAR is sent the IP-address of all other hosts that it should be able to reach in a new parameter, e.g. PingCheck(["123.456.789.012", "222.222.222.222"]).
• EDGAR pings these IP-addresses instead.
• See, if we can remove the list of addresses of other peers from the OldPeerConfiguration.