Remove our two borg hosts from the inventory

These are managed services and Ansible doesn't run on them. It got boring writing 'all,!rsync_net,!hetzner_storageboxes' in playbooks and ad-hoc commands, so remove these borg hosts from our inventory.

In the process to accomplish the above, I refactored the roles that set up our borg hosts to run on localhost; seems to work well and should prove more flexible if we were to get another storage box.

requested review from @svenstaro and @klausenbusk

added 1 commit

• 22f4adb8 - Place borg host vaults under host_vars/localhost/

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added 1 commit

• de9c1be7 - tasks/sync-ssh-hostkeys: use blocks for shell cmds

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added 5 commits

• 4b94feb7 - rsync_net: refactor to execute on localhost
• 6741138b - hetzner_storagebox: refactor to run on localhost
• dc0f4655 - Remove our two borg hosts from the inventory
• 03600a8c - Place borg host vaults under host_vars/localhost/
• aa4b5495 - tasks/sync-ssh-hostkeys: use blocks for shell cmds

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mentioned in commit 29c4d97a

merged