Fix Windows command-line argument quoting in the Python test harness.
Arguments ending with a backslash were not correctly quoted, among other
issues. This reverts r875257.
* subversion/tests/cmdline/svntest/main.py
(_quote_arg): Do the quoting more correctly, using subprocess.list2cmdline()
on Windows and in-line code on Unix.
(open_pipe): Pass the list of arguments directly to subprocess.Popen()
instead of trying to quote it ourselves on Windows. Use our own quoting
only for display purposes.
git-svn-id: http://svn.apache.org/repos/asf/subversion/trunk/subversion/tests/cmdline@1033584 13f79535-47bb-0310-9956-ffa450edef68