RFR: 8284866: Add test to JDK-8273056 [v2]

[Raffaello Giulietti]

> Hello,
> this is a followup of JDK-8273056 to add a test to check that Random.nextExponential() produces non-negative results.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8284866: Add test to JDK-8273056
  
  Added copyright notice.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8243/files
  - new: https://git.openjdk.java.net/jdk/pull/8243/files/7ef3969d..792b5bab

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8243&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8243&range=00-01

  Stats: 23 lines in 1 file changed: 23 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8243.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8243/head:pull/8243

PR: https://git.openjdk.java.net/jdk/pull/8243