Fc.agent

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- Minor output improvement on VM image update script.

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- Introduce base image management: clone VM images for our branches
(dev, staging, production) into Ceph's 'rbd' pool to use for cloning
new VMs.

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- Improve directory/nagios consistency check (19425).

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- Increase Ceph GiB/PG ratio to 16 (18803).
- Don't count snapshots for GiB/PG ratio calculation (18803).

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- Ceph RBD volumes are now deleted when a VM enters 'hard' deletion state
(19129).
- Fold `localconfig-ceph-pools` and `localconfig-ceph-purge-volumes` into
`localconfig-ceph-volumes` (19129).
- Reenable check_nagios_directory_sync (18598).

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- Improve handling of deleted VMs in both bacula and backy configuration scripts
(13456)
- Add check for incompletely bootstrapped VMs (18600)