Add locks for each Blob and store Stats in a map #219
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flush_countonVBucketsso we don't destroy one with outstanding flushes.StatsandTicketMutexfor eachBlob. Moving theStatsto a map improves the lookup efficiency fromO(n)toO(1). The Blob mutexes are required for implementing asynchronous flushing.stb_ds.hfor maps with non-string keys. Previously we were only using maps with string keys. Also added a couple bug fixes from upstream.