vlmcd: Rename VF_VOLUME_FREEZED to VF_VOLUME_FROZEN
vlmcd: Support X_FLUSH operation
ext_scripts: Always use assume_v0 on create

Always use assume_v0 when creating a new volume. Also extend the scripts to take
an extra "origin_size" argument, to be used as the provided v0_size.
archipelago: Implement volume listing
archipelago: Remove obsolete '-u' option

Remove obsolete '-u' option from Archipelago cli. Since there is no kernel space
part, all Archipelago interactions affect only userspace components.

Using the new blktap infrastructure, during restarts all mapped volumes are
"paused". This allows us to safely perform a full Archipelago restart.
The administrator cannot stop Archipelago when mapped volumes exist, unless the
new '--force' flag is used.
archipelago: Remove obsolete '--pool' argument
vlmc: Validate volumes names

Validate volume names. Disallow all volumes:
 * Starting with 'archip_'
 * Ending in '_lock'
 * Ending in '_(hex number){16}'