RFR: JDK-8281183: RandomGenerator:NextDouble() default behavior partially fixed by JDK-8280950

[Joe Darcy]

Third time should be the charm to get this issue of out-of-bounds random numbers fully fixed; sorry for the noise.

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Commit messages:
 - JDK-8281183: RandomGenerator:NextDouble() default behavior partially fixed by JDK-8280950

Changes: https://git.openjdk.java.net/jdk/pull/7360/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7360&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281183
  Stats: 7 lines in 2 files changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7360.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7360/head:pull/7360

PR: https://git.openjdk.java.net/jdk/pull/7360