Disable LinkedTransferQueueTest tests failing on the CC.

The following libcore tests randomly fail on the
concurrent collector (CC) configuration:
- jsr166.LinkedTransferQueueTest#testTransfer2
- jsr166.LinkedTransferQueueTest#testWaitingConsumer
It seems that it is due to
SR166TestCase.waitForThreadToEnterWaitState timing out.
Disable those tests while we investigate.

Bug: 25883050
Change-Id: I4f310c677869d9e2701738e9734a1f53b5939f18