Add support for multiple target addresses in CloudFlare provider #970
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This is an attempt to fix #887.
I took a bit of a lazy route to implement this, instead of trying to manage equivalence state for record updates and/or refactoring most the provider, I simply took the same solution rancher/external-dns's CloudFlare provider took, and implemented updates as a sequence of delete + create for all records matching the combination of name and type.
CloudFlare does not seem to support records with real 'sets' of targets in basic DNS - it seems to do so in the additional-cost 'load balancing' product - though this should work well in theory.