refactor configd calls, part of this discussion : https://github.com/opnsense/core/commit/71ff705e01b0a8b95b4a41973b579a468d0a8c7c#commitcomment-10597568

Signing is going on in the background, syncing the fingerprint
into the system, but the actual verification will wait until
the next major release.  This is pretty neat in any case...