Use a dedicated thread for tcp listener #1752

Job	Run time
Linux [UBSAN] [lmdb \| clang]	40m 55s
macOS [UBSAN] [lmdb \| clang]	32m 41s
Linux [ASAN] [lmdb \| clang]	37m 31s
macOS [ASAN] [lmdb \| clang]	26m 33s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 14s
macOS [TSAN] [lmdb \| clang]	30m 8s
Linux [TSAN] [lmdb \| clang]	36m 49s
macOS [UBSAN] [rocksdb \| clang]	35m 26s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	37m 45s
macOS [ASAN] [rocksdb \| clang]	34m 39s
Linux [UBSAN] [rocksdb \| clang]	44m 47s
macOS [TSAN] [rocksdb \| clang]	45m 13s
Linux [ASAN] [rocksdb \| clang]	51m 18s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	52m 3s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	50m 50s
	9h 54m 52s

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