cnf: add JUnit 4

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
junit: upgrade to junit 4.11

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
biz.aQute.repository: move test helpers back into test folder

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
biz.aQute.resolve: move test helpers back into test folder