The gandi api has changed its url for a more stable
one. Although https://dns.beta.gandi.net will continue to
work for the foreseable future, this commits updates the
url to new official one.
* add API for Gandi LiveDNS
* ensure Gandi API key is saved for renewing certificate.
* gandi_livedns: use PUT instead of POST for creating DNS record
* gandi_livedns: fix formatting
* dns_gandi_livedns: fix shellcheck errors