[8u40] RFR 8066397 Remove network-related seed initialization code in ThreadLocal/SplittableRandom

[Paul Sandoz]

Hi,

Please approve a backport of 8066397 to 8u40.

Review in 9 here:

  http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-December/029996.html

Changes apply cleanly to 8udev when shuffled from 9:

  http://hg.openjdk.java.net/jdk9/dev/jdk/rev/0761cc66b983

Paul.