Add SWIG python support for inherited properties with svn_client_propget5
and svn_client_proplist4.

* subversion/bindings/swig/include/svn_containers.swg:
  (OUTPUT_OF_PROP_INHERITED_ITEM): New.

* subversion/bindings/swig/include/svn_types.swg
  (svn_proplist_receiver2_t): New.

* subversion/bindings/swig/python/libsvn_swig_py/swigutil_py.h
* subversion/bindings/swig/python/libsvn_swig_py/swigutil_py.c
  (svn_swig_py_propinheriteditemarray_to_dict,
   svn_swig_py_proplist_receiver2): New.

* subversion/bindings/swig/python/tests/client.py
  (test_inherited_props): New.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1464891 13f79535-47bb-0310-9956-ffa450edef68