apiv3 API v3 authentication authentication availabilityzones availability zones baremetal baremetal barbican Barbican cells cell configdrive config drive ephemeral_storage_encryption ephemeral storage encryption fping fping hyperv HyperV hypervisor hypervisor ironic bare metal ipv6 IPv6 libvirt Libvirt livemigration live migration pci PCI periodic periodic quobyte Quobyte USP volume driver rdp RDP rpc_all all RPC serial_console serial console spice SPICE tilera Tilera trustedcomputing trusted computing upgrade_levels upgrade levels vnc VNC volumes volumes xen Xen xvpnvncproxy XCP VNC proxy zookeeper Zookeeper