Following up on r1567752, use proper cleanup tracked temp directories instead
of filling up the general temp directory for the autoprop tests.

* subversion/tests/cmdline/autoprop_tests.py
  (autoprops_test,
   inheritable_autoprops_test): Use tracked tempdir based on sbox name.
  (svn_prop_inheritable_autoprops_add_versioned_target):
    Don't use a shared directory for a test specific temp dir.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1567819 13f79535-47bb-0310-9956-ffa450edef68