Changes to V7:
* update the words a little to avoid confusing in v6.
===========================================================================
Domain snapshot includes disk snapshots and domain state saving. domain
could be resumed to the very state when the snapshot was created. This
kind of snapshot is also referred to as a domain checkpoint or system
checkpoint. It's consistent.
Disk snapshot is inconsistent if the domain is running. To libxl,
even domain is paused, there is no data flush to disk operation. So, for
active domain (domain is started), take a disk-only snapshot and then
resume, it is as if the guest had crashed. For this reason, we won't
support disk-only snapshot in libxl.
Within domain snapshot, disk snapshot could be "internal" (like in qcow2
format, snapshot and delta are both in one image file), or "external"
(snapshot in one file, delta in another).
Expected 4 types of operations:
"domain snapshot create":
means saving domain state (if not disk-only) and doing disk snapshots.
"domain snapshot revert":
means rolling back to the state of indicated snapshot.
"domain snapshot delete":
delete indicated domain snapshot.
"domain snapshot list":
list domain snapshot information.
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