On the pin-externals test, tweak the regression test.
On the pin-externals test, tweak the regression test.

* subversion/tests/cmdline/externals_tests.py
  (copy_pin_externals): Adjust verify_pinned_externals() helper so it can
   be used to verify the gamma-moved external.


git-svn-id: 50c5f5df37af4354ae6e67714fc94b8d09273154@1654548 13f79535-47bb-0310-9956-ffa450edef68

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