Add test for svn_auth_get_keychain_simple_provider.
Add test for svn_auth_get_keychain_simple_provider.

* subversion/bindings/swig/ruby/test/test_client.rb
  (SvnClientTest#assert_simple_provider): New assertion.
  (SvnClientTest#test_simple_provider,
   SvnClientTest#test_windows_simple_provider): Use assert_simple_provider.
  (SvnClientTest#test_keychain_simple_provider): New test.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@864075 13f79535-47bb-0310-9956-ffa450edef68

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