Add tests for the Python bindings of various auth prompt providers.
Add tests for the Python bindings of various auth prompt providers.

* subversion/bindings/swig/python/tests/auth.py
  (test_invalid_cred_kind, test_credentials_get_username,
  test_credentials_get_simple, test_credentials_get_ssl_client_cert,
  test_credentials_get_ssl_client_cert_pw): New functions.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@868425 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion