Add test for issue #4093 'remapping a file external can segfault due to "deleted" props'.
Add test for issue #4093 'remapping a file external can segfault due to
"deleted" props'.

* subversion/tests/cmdline/externals_tests.py
  (remap_file_external_with_prop_del): New.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1228340 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion