Add test of skipped path mergeinfo overrides.
Add test of skipped path mergeinfo overrides.

* subversion/tests/cmdline/merge_tests.py
  From svntest.main import skip_test_when_no_authz_available,
  write_restrictive_svnserve_conf, and write_authz_file.
  (mergeinfo_and_skipped_paths): New.
  (test_list): Add mergeinfo_and_skipped_paths, set as XFail.

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