Revision 1819804

Fix 'shelve' when the current working directory is not the WC root.

This makes the diff paths in the patch file be relative to the WC root, as
intended.

Found by: jamessan

* subversion/libsvn_client/shelve.c,
  (svn_client_shelf_write_patch): Make the diff use paths relative to WC root.

* subversion/tests/cmdline/shelve_tests.py
  (shelve_unshelve_verify): New; extracted from shelve_unshelve().
  (shelve_from_inner_path): New test.
  (test_list): Run it.