Regression test for inheritied properties after upgrading a 1.7 working copy.

* subversion/tests/cmdline/upgrade_tests.py
  (iprops_upgrade): New test.
  (test_funcs): Add new test.

* subversion/tests/cmdline/upgrade_tests_data/iprops_upgrade_nonroot.tar.bz2:
  New file.

* subversion/tests/cmdline/upgrade_tests_data/iprops_upgrade_root.tar.bz2:
  New file.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1476155 13f79535-47bb-0310-9956-ffa450edef68