Gandi supports setting multiple entries by setting multiple array items
for the rrset_values field in their API. Modify the dns_gandi_livedns.sh
script so that it checks for existing entries, appends new ones if
needed, and removes existing ones individually. This enabled wildcard
certificate support on Gandi.
Fixes the dns_gandi_livedns part of #1261.
Tested for creating a multidomain, multiple wild-card certificate on
Gandi and using a test script executing only the dns_gandi_livedns_add
and dns_gandi_livedns_rm functions.
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
