New script, clone_image to simplify create/snapshot from a node.
clone_image is a wrapper around newimageid_ez and create_image, that simplifies the most common operation; creating a new imageid derived from the image/os that is currently running in the node, and then taking a snapshot of the node. So for example, if node pcXXX is running image FREEBSD, and you want to create a custom image from that node, all you need to do: boss> clone_image myfreebsd pcXXX which will create the new descriptor, deriving everything from the FREEBSD image on the node, and then take a snapshot from pcXXX. If the descriptor already exists, just take the snapshot. So what if you do: boss> clone_image FREEBSD pcXXX well, the image is always looked up in the project the node is currently attached to, so in fact a new descriptor is created in that project, and you do not actually overwrite an image from some other project. I've added some locking to images to prevent concurrent snapshots. This seemed like a good idea since this script is going to be used from the ProtoGeni interface. More on this in another commit.
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