run-tests: add more scheduling weight hints The scheduler would like to order test execution by expected run-time, but doesn't know much about how long a test will run. It thus uses test size as a proxy for run-time. By tweaking these weights we can keep CPUs more evenly busy and thus finish sooner. In particular, this change pushes the three currently longest-running tests closer to the beginning: test-largefiles-update.t test-run-tests.t test-gendoc.t As the largefiles test is currently the long pole of the test suite with higher -j factors, the sooner it's started, the sooner the tests can end. We also up the weight on some shorter but long-running tests that could have previously delayed completion with low -j factors by running very close to the end.