Needs single stage volume copy

[rgoley-eti]

I really like the korb utility. I have run into scenarios that the korb utility does not really handle though. One scenario is if the stage1 of a copy-twice-name process completes but the stage2 fails due to something else binding to the volume or if the src volume fails to delete in general. That leaves data intact but it exists with the wrong name for existing deployments. I did not see a way to do a single pvc copy that would be the equivalent of the stage2 copy. I only saw copy-twice-name, export, and import strategies unless I missed something in the code.

The ideal fix for this would be to be able to perform a singe stage copy by specifying source and destination pvc names.