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Allows users to be able to specify one or more partition keys to be disallowed from being read from or written to C*.

Non-Goals

This feature will not include any auto detection of such partition keys, and instead relies on the operator to specify the partition keys to be disallowed.

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• New API to aid with adding partitions to deny list
• [Alternate solution] Nodetool command and jmx to add partition to deny list (along the lines of public boolean denyListKey(String keyspace, String table, String keyAsString))
• Pro: More friendly and easier for operator
• Con: Although being a nodetool command, it would impact the entire cluster by informing the cluster of the new partition to be denylisted (and not just the node the command is being run on)

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