Merge branch 'ad-parallel-tests' into next * ad-parallel-tests: Fix LAZY_TEST_SUITE handling and $(TEST_SUITE_LOG) recreation. Fix parallel-tests with empty $(TESTS) for BSD make. Mark check-html and check-TESTS as recursive for BSD make. Match XFAIL_TESTS correctly with Solaris make. Use append mode to capture parallel test output. parallel-tests: Fix summary output. Overhaul of tests/README. Documentation for the parallel-tests driver. New tests for `parallel-tests'. parallel-tests: Ensure backward-compatible semantics. Parallel test execution: new option `parallel-tests'.