To add lint to jenkins testing, we need junit.xml output. This adds an optional --junit command line parameter to enable output to an xml file in the lint directory. Change-Id: I5588190cb050b9dbe99458cb18a71a147769f50e Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: http://review.coreboot.org/11891 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>