Follow-up to r15167, suppress Python warnings about os.tempnam on Win32.
Follow-up to r15167, suppress Python warnings about os.tempnam on Win32.

See also r2957.

* subversion/tests/cmdline/svnversion_tests.py
  Import warnings module and add warning filter.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@864662 13f79535-47bb-0310-9956-ffa450edef68

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