storage: document RBD/Ceph (librbd LUKS2) volume encryption#665
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Rework the Volume Encryption admin-guide section to describe the offering-based enablement (an encrypted Disk/Compute Offering) as the primary mechanism, with KMS as an optional passphrase-wrapping layer rather than the only path. Add the supported primary-storage backends and the Ceph/RBD librbd LUKS2 specifics: thin provisioning, copy-on-write encrypted root clones, the libvirt >= 10.1.0 hot-plug requirement, and the KVM host requirements.
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Encrypted Ceph/RBD volumes require ceph-common (the rbd CLI) on every KVM host - a dependency that non-encrypted RBD does not have, since normal RBD I/O goes through libvirt+librbd. Call this out as an operational trade-off versus the qemu-native LUKS stack, which needs no extra Ceph tooling.
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towards apache/cloudstack#13556
📚 Documentation preview 📚: https://cloudstack-documentation--665.org.readthedocs.build/en/665/
📚 Documentation preview 📚: https://cloudstack-documentation--665.org.readthedocs.build/en/665/