Follow up to r1560690: add a test case for copying relocated sources.

* subversion/tests/cmdline/copy_tests.py: Import 'sys'.
  (copy_relocate): New test case.
  (test_list): Add copy_relocate.

Patch by: rhuijben (tweaked by me)


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1560701 13f79535-47bb-0310-9956-ffa450edef68