Re-ordered class definitions (moved _Predicate classes next to each other).
Re-ordered class definitions (moved _Predicate classes next to each other).

* subversion/tests/cmdline/svntest/testcase.py: Re-ordered class
  definitions to move _Predicate and the two classes derived from it
  (XFail and Skip) together.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion