Add a JavaHL test for getting status from an external tree.

* subversion/bindings/javahl/tests/org/apache/subversion/javahl/BasicTests.java
  (BasicTests.testExternalStatus): New test case.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1636101 13f79535-47bb-0310-9956-ffa450edef68