RFR: 8289508: Improve test coverage for XPath Axes: ancestor, ancestor-or-self, preceding, and preceding-sibling

[Rahul Prabhu]

Created two files for testing XPath Axes: XPathAncestors.java tests the ancestor and ancestor-or-self axes, while XPathPrecedingTest.java tests the preceding and preceding-sibling axes.

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Commit messages:
 - Update XPathAncestorsTest.java to remove whitespace
 - 8289508: Update PrecedingTest to remove whitespace
 - 8289508: update to remove whitespaces in XPathAncestorsTest.java
 - Delete XPathAncestorsPrecedingTest.java
 - 8289508: Improve test coverage for XPath Axes: ancestor, ancestor-or-self, preceding, and preceding-sibling, separated tests and labeled testing between ancestor and preceding
 - 8289508: Improve test coverage for XPath Axes: ancestor, ancestor-or-self, preceding, and preceding-sibling
 - Merge branch '8289508' of github.com:Ruprabhu25/jdk into 8289508
 - added test for ancestor/preceding and related axes
 - 8289508 Improve test coverage for XPath Axes: ancestor, ancestor-or-self, preceding, and preceding-sibling

Changes: https://git.openjdk.org/jdk/pull/10211/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10211&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289508
  Stats: 359 lines in 2 files changed: 359 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10211.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10211/head:pull/10211

PR: https://git.openjdk.org/jdk/pull/10211