Follow-up to r1164765: Remove another test that's now trivially included.
Follow-up to r1164765: Remove another test that's now trivially included.

* subversion/tests/cmdline/externals_tests.py
  (commit_file_external): Remove test, obsoleted by r1164765.
  (copy_file_externals): Comment tweak.
  (test_list): Remove commit_file_external().



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1164780 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion