Add test to verify that we don't allow checking out file externals from a repository with a different repository root. (Currently wc-ng assumes that all nodes in a directory are from the same  repository (url and uuid), just like wc-1.0. svn status will asserts this  condition)
Add test to verify that we don't allow checking out file externals from a
repository with a different repository root.
(Currently wc-ng assumes that all nodes in a directory are from the same
 repository (url and uuid), just like wc-1.0. svn status will asserts this
 condition)

* subversion/tests/cmdline/externals_tests.py
  (imports): Add shutil.
  (file_externals_different_repos): New function.
  (test_list): Add test.

Found by: danielsh

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