VyOS has several services relaying on the PKI CLI tree to retrieve certificates.
Consuming services like ethernet, openvpn or ipsec all re-implemented the same
code to retrieve the certificates from the CLI.
This commit extends the signature of get_config_dict() with a new option with_pki
that defaults to false. If this option is set, the PKI CLI tree will be blended
into the resulting dictionary.
This is the first extension to VyOS to support specifying a certificate retrieved via ACME protocol.