create a signature for a pub-key with a priv-key and write it to a file
added public-key-signature generation logic
add documentation for salt-keys signature generation options to manpage
add signature generation cmd-line options to salt-key
add signature-path to manpage
add msg that signature is created
add message that new signing-pair is generated, pass correct key-var to crypt.gen_signature
cleanup logic to have the KeyCLI properly go through the Key-Class
Merge pull request #14087 from felskrone/salt-key_gen_signature

Salt key gen signature