RFR: 8273401: Remove JarIndex support in URLClassPath

Tue Sep 7 03:42:59 UTC 2021

There is a bug for URLClassPath.findResources with JarIndex.
With some discussions about the bug, the current priority is to remove the JAR index support in URLClassPath, 
and don’t need to do anything to the jar tool in the short term, except just to move JarIndex to the jdk.jartool module. 

The PR includes:
1. remove the JarIndex support in URLClassPath
2. move JarIndex into  jdk.jartool module.

-------------

Commit messages:
 - 8273401: Remove JarIndex support in URLClassPath

Changes: https://git.openjdk.java.net/jdk/pull/5383/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5383&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273401
  Stats: 1117 lines in 21 files changed: 7 ins; 1098 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5383.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5383/head:pull/5383

PR: https://git.openjdk.java.net/jdk/pull/5383