Fix for CollectionTest not running properly on vogar + missing tests

Made CollectionTest non-public, is shouldn't cause problems
with vogar anymore. Also, CTS currently doesn't find nested tests,
so I've moved some from  the LinkedTransferQueueTest to
separate files.

Bug: 27673907
Change-Id: Iee6ecdee3128353f360ead7641cbafcb331f5644
4 files changed