Followup to r24383.  Define boolean values False and True if they aren't provided by the Python running the tests.  (These were added in Python 2.2.)
Followup to r24383.  Define boolean values False and True if they aren't
provided by the Python running the tests.  (These were added in Python 2.2.)

Suggested by: mhagger

* subversion/tests/cmdline/svntest/main.py
  Try to use False.  If that throws and exception, define True and False.

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