Exit and Join the background compaction threads while running rocksdb tests
Summary: The background compaction threads are never exitted and therefore caused memory-leaks while running rpcksdb tests. Have changed the PosixEnv destructor to exit and join them and changed the tests likewise The memory leaked has reduced from 320 bytes to 64 bytes in all the tests. The 64 bytes is relating to pthread_exit, but still have to figure out why. The stack-trace right now with table_test.cc = 64 bytes in 1 blocks are possibly lost in loss record 4 of 5 at 0x475D8C: malloc (jemalloc.c:914) by 0x400D69E: _dl_map_object_deps (dl-deps.c:505) by 0x4013393: dl_open_worker (dl-open.c:263) by 0x400F015: _dl_catch_error (dl-error.c:178) by 0x4013B2B: _dl_open (dl-open.c:569) by 0x5D3E913: do_dlopen (dl-libc.c:86) by 0x400F015: _dl_catch_error (dl-error.c:178) by 0x5D3E9D6: __libc_dlopen_mode (dl-libc.c:47) by 0x5048BF3: pthread_cancel_init (unwind-forcedunwind.c:53) by 0x5048DC9: _Unwind_ForcedUnwind (unwind-forcedunwind.c:126) by 0x5046D9F: __pthread_unwind (unwind.c:130) by 0x50413A4: pthread_exit (pthreadP.h:289) Test Plan: make all check Reviewers: dhruba, sheki, haobo Reviewed By: dhruba CC: leveldb, chip Differential Revision: https://reviews.facebook.net/D9573
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