Add host publicky to `spc host` and `spc host -v` output
For people manually registering their provider instance it is important to know the ID (the publickey) of the provider.
To make that easy the publickey is added to the output of spc host
and spc host -v
as first line, like
Provider ID : 4cc8c27aa56462491dd4af5603af17d83d4af35acc1af5d50ca7bbc3dc0407c3