Added tests for namespace Axis. Tests incluse namspace expressions, namespace node counts and namespace node scope.
------------- Commit messages: - JDK-8289510 : Improve test coverage for XPath Axes: namespace Changes: https://git.openjdk.org/jdk/pull/9906/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9906&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8289510 Stats: 163 lines in 1 file changed: 163 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/9906.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9906/head:pull/9906 PR: https://git.openjdk.org/jdk/pull/9906
