Use redundant network connections

[UsualSpec]

While this is not related to the code, it could be beneficial to also enable WiFi (if available) as redundant fallback for the Pies as we currently only plan to use a wired connection. This allows us to automatically fall over in case of network failure. Data upload and management is expected to work over any connection.

Zabbix connection may not work as the IP changes in case the wired connection is down and we use the current IP of client based connection method of Zabbix.