Associate an existing XFail test with issue #3796 'svn switch to URL requires access to URL's parent'.
Associate an existing XFail test with issue #3796 'svn switch to URL
requires access to URL's parent'.

* subversion/tests/cmdline/authz_tests.py

  (authz_switch_to_directory): As above.  Also, add the --ignore-ancestry
   option while attempting the switch so the test doesn't fail with the
   new (in 1.7) "Path 'blah' does not share common version control ancestry
   with the requested switch location.  Use --ignore-ancestry to disable
   this check" error.

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