RFR: JDK-8281001 Examine the behavior of Class::forName if the caller is null

[Tim Prinzing]

The Class::forName behavior change to match JNI FindClass is a compatible change and seems pretty attractive as it would be expected that Class::forName would give the same behavior as FindClass which uses the system classloader.  The test for 8281006 was enhanced to test for this change.  Merged master to pick up fixes to unrelated test failures to reduce noise.

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Commit messages:
 - Merge branch 'master' into JDK-8281001
 - JDK-8281001 Examine the behavior of Class::forName if the caller is null

Changes: https://git.openjdk.java.net/jdk/pull/8711/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8711&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281001
  Stats: 19 lines in 3 files changed: 18 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8711.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8711/head:pull/8711

PR: https://git.openjdk.java.net/jdk/pull/8711