RFR 8098798: Thread.join(ms) on Linux still affected by changes to the time-of-day clock

[Roger Riggs]

Please review changes for:

8098798: Thread.join(ms) on Linux still affected by changes to the 
time-of-day clock
     Use System.nanoTime to compute any remaining delay
8210004: Thread.sleep(millis, nanos) timeout returns early
     Avoid an early return by rounding the milliseconds up if there are 
any nanoseconds as was done in Object.wait(ms, ns).

(If its not appropriate to do the two reviews together, I can split them).

Webrev:
http://cr.openjdk.java.net/~rriggs/webrev-thread-early-8098798/

Thanks, Roger