Fix CloudFlare provider to return a single endpoint for each name/type.

[shasderias]

#970 adds support for multiple target addresses to the CloudFlare provider. However, CloudFlare does not support "sets" of targets for each DNS name/type pair but instead returns a single entry for each name/type/target. This confuses the planner when calculating the set of changes, leading to #992 - where external-dns recreates the same entries over and over.

This pull request changes the CloudFlare provider's Records() method to group all supported records by name and type, and to return a single endpoint with all the targets for each name/type, allowing the planner to compute the correct set of changes.

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[shasderias]

CLA signed

[Raffo]

/lgmt

WDYT @njuettner ?

[njuettner]

Nice! Thanks for contributing.

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: njuettner

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[njuettner]

/lgtm