Implement hoster init check

[yaroslav-gwit]

I want to implement a feature that will check if the hoster was initialised after boot. This will improve the overall user experience, because sometimes one can simply forget to run init after the host has been rebooted.

The check will be integrated into every every function, and if hoster wasn't init-ed yet, the binary will exit with code 101 and a message stating that you need to execute hoster init first.

[yaroslav-gwit]

The feature has been implemented. Now every CLI command will check if the init file exists before executing the underlying functions. For the curious out there, the state file resides here:

/var/run/hoster_init