CCS: Level 2 cache thread safety

The level 2 CCS cache is not thread safe but it is insufficiently documented as requiring the user to stop outgoing RPC calls during a level 2 cache rebuild and to have the master persona. The lack of thread safety is intentional to remove overheads but puts a burden on the user to rebuild the level 2 cache correctly. It would be more user-friendly to remove the level 2 cache in favor of evicting and replacing entries from the level 1 cache.

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