* Fix multiple subnet (of same IP version) idempotence for docker_network.
* Add changelog.
* Unit tests no longer make sense, since the part of the code they test has been removed.
* Re-add CIDR validation. Move it to better position (module setup instead of idempotence check).
* Update changelog.
* Only run new tests on VM test images.
* Actually do what is documented. Especially since an empty object is a valid value for aux_addresses.
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