JDK 9 RFR of 8163136: Add print statements to java/nio/file/WatchService/LotsOfCancels.java

[Brian Burkhalter]

Please review this test-only patch at your convenience.

Issue:	https://bugs.openjdk.java.net/browse/JDK-8163136
Patch:	http://cr.openjdk.java.net/~bpb/8163136/webrev.00/

Add some print statements to see the state of the test if it times out.

Thanks,

Brian