Prevent threads from respawning during joining
Summary: Previously the thread pool might be non-empty after joining since concurrent submissions could spawn new threads. This problem didn't affect our background flush/compaction thread pools because the `shutting_down_` flag prevented new jobs from being submitted during/after joining. But I wanted to be able to reuse the `ThreadPool` without such external synchronization. Closes https://github.com/facebook/rocksdb/pull/2953 Differential Revision: D5951920 Pulled By: ajkr fbshipit-source-id: 0efec7d0056d36d1338367da75e8b0c089bbc973
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