Fix NameError bug in r21453 (Conflict file singleton handler consolidation).
Fix NameError bug in r21453 (Conflict file singleton handler consolidation).

Class SVNTreeUnequal is defined in tree.py, specifying the module is an
error.

* subversion/tests/cmdline/svntest/tree.py
  (detect_conflict_files): SVNTreeUnequal alone is sufficient.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@861532 13f79535-47bb-0310-9956-ffa450edef68

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