Configuration and environment variable improvements #1888

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 53s
macOS [UBSAN] [lmdb \| clang]	31m 54s
Linux [ASAN] [lmdb \| clang]	41m 41s
macOS [ASAN] [lmdb \| clang]	27m 13s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 27s
macOS [TSAN] [lmdb \| clang]	29m 53s
Linux [TSAN] [lmdb \| clang]	39m 43s
macOS [UBSAN] [rocksdb \| clang]	1h 6m 25s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 4s
macOS [ASAN] [rocksdb \| clang]	1h 5m 42s
Linux [UBSAN] [rocksdb \| clang]	1h 21m 56s
macOS [TSAN] [rocksdb \| clang]	1h 10m 37s
Linux [ASAN] [rocksdb \| clang]	1h 20m 5s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	1h 19m 9s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	1h 18m 34s
	13h 32m 16s

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