test run: feature for nicer jenkins interaction
test run: feature for nicer jenkins interaction

	. add -l option to list available tests
	. add -t option to specify tests to run
	. also improve the root check a bit by
	  not relying on an environment var
	. do not print the human-friendly banner & summary
	  if a test list is given to make the test
	  results easy to parse

Change-Id: Id0f87d485240b1924d667af788338ae31c3dc94c

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi