Extend the JavaHL status test to verify the ambient depth.

[in subversion/bindings/javahl/tests/org/apache/subversion/javahl]
* WC.java
  (WC.setItemDepth): New method.
  (WC.check(Status[], ...): Verify the ambient depth, if enabled.
  (WC.Item.depth): New member; defaults to null, which implies no check.
  (WC.Item.Item): Set depth durgin copy-construction.
* BasicTests.java
  (BasicTests.testBasicStatus): Verify the ambient depth of the WC root
   and the file "iota". Cover all cases of returned status during
   test result verification.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1577112 13f79535-47bb-0310-9956-ffa450edef68