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It seems we spend a lot of time waiting for `bitcoind` and `lightningd` to talk to disks. This adds the `TEST_DIR` environment variable, allowing for example to use `/dev/shm`, or a faster disk than the disk `/tmp` is on, as the root directory for all test-related files. Testing this on one of our builder machines cut the time to run the entire suite under valgrind roughly in half (180-200 seconds vs 440-490 seconds).