Move the utf8_tests.py file to a legacy directory to stop it from
showing up as a skipped test.

This test has been disabled in 2005 (r853867 or originally r13793),
and fixing this test has been open since then as issue #2079
"utf8_tests.py should be made non-iso8859-1 specific"

* subversion/tests/cmdline/legacy
* subversion/tests/cmdline/legacy/utf8_tests.py
  New directory containing the utf8_tests.py file.
  
* cmdline/utf8_tests.py
  Removed file here, to make it invisible for the pattern in build.conf


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1461649 13f79535-47bb-0310-9956-ffa450edef68