RFR: JDK-8264454 : Jaxp unit test from open jdk needs to be improved

[Mahendra Chhipa]

JDK-8264454 : Jaxp unit test from open jdk needs to be improved

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Commit messages:
 - JDK-8264454 : Jaxp unit test from open jdk needs to be improved
 - JDK-8064681 : Jaxp unit test need to be improved

Changes: https://git.openjdk.java.net/jdk/pull/3274/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3274&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264454
  Stats: 743 lines in 8 files changed: 71 ins; 596 del; 76 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3274.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3274/head:pull/3274

PR: https://git.openjdk.java.net/jdk/pull/3274