RFR: JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null [v7]

[Tim Prinzing]

> JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null

Tim Prinzing has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 10 commits:

 - Merge master
 - fix test breakage from rename
 - reformat test summary
 - reformat test summary
 - improve test name and remove experimental test code
 - fix copyright date
 - More changes from feedback.
   
   The javadoc is improved to reflect InvalidCallerException is thrown with
   a caller that can't be assigned to a ClassLoader as well as a null
   caller frame.  Added a test IsParallelCapableBadCaller that uses
   reflection hackery to create a case where called with an invalid caller
   on the call stack.
 - Changes from feedback.
   
   - Copyright dates fixed
   - IllegalCallerException thrown for no caller frame, and associated
   javadoc changes
   - test changed to look for IllegalCallerException thrown.
 - Merge branch 'master' into JDK-8281000
 - JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null

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Changes: https://git.openjdk.java.net/jdk/pull/7448/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7448&range=06
  Stats: 216 lines in 5 files changed: 216 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7448.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7448/head:pull/7448

PR: https://git.openjdk.java.net/jdk/pull/7448