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hcloud_inventory: Optimize --list to avoid --host calls

Evangelos Foutras requested to merge optimize-hcloud_inventory into master

By adding a top-level element called "_meta" to the --list response, Ansible will not call the inventory script with --host for each host thus saving a lot of time and many requests to the Hetzner Cloud API.

The speed-up is significant; ansible-inventory --list is down from about 1 minute to just 7 seconds in my testing (with ~60ms latency).

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