Add a check-and-set to deleteKV without changing return type #202
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The main dilemma with adding check-and-set to deleteKV is that all the
delete KV methods return Response. Consequently we can't actually
return whether the c-a-s worked. We can't change Response to
Response without breaking a lot of existing code.
This just adds the capability for check-and-set but punts on the
Response problem. If callers want to see if the delete succeeded,
they'll have to do another getKV. However, this is the least invasive
version of this change.
#49