Merge branch 'sg/stress-test'

Flaky tests can now be repeatedly run under load with the "--stress" option. * sg/stress-test: test-lib: add the '--stress' option to run a test repeatedly under load test-lib-functions: introduce the 'test_set_port' helper function test-lib: set $TRASH_DIRECTORY earlier test-lib: consolidate naming of test-results paths test-lib: parse command line options earlier test-lib: parse options in a for loop to keep $@ intact test-lib: extract Bash version check for '-x' tracing test-lib: translate SIGTERM and SIGHUP to an exit