Merge branch 'jk/test-output'

When TEST_OUTPUT_DIRECTORY setting is used, it was handled somewhat inconsistently between the test framework and t/Makefile, and logic to summarize the results looked at a wrong place. * jk/test-output: t/Makefile: don't define TEST_RESULTS_DIRECTORY recursively test output: respect $TEST_OUTPUT_DIRECTORY t/Makefile: fix result handling with TEST_OUTPUT_DIRECTORY