Add snapshot subcommand to qemu-img which allows to list, create, apply
and delete snapshots on qcow2 images.

Signed-off-by: Kevin Wolf <kwolf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6215 c046a42c-6fe2-441c-8c8c-71466251a162