Failover protection for openHAB

[florian-h05]

Create a failover for openHAB, which works in the following way:

• A script on the openHAB system is copying the config files to the failover host
• A script on the failover host is checking whether the REST API is reachable. If not, then start the openHAB Docker container. Access to openHAB is done via myopenhab service.

[florian-h05]

To-Do:

• Create the copy script on the openHAB host
• Create the script on the failover host to check for openHAB reachability
• Create the docker-compose.yml file
• Add the documentation
• Fix the misspellings in the documentation