Add ellipsis option to doctests.

This means we can include `...` as in output for doctests. Particularly
useful if we want to just make sure a particular command runs (the
output may change over time).

doctests.py

@@ -7,7 +7,8 @@ def load_tests(loader, tests, ignore):
     for root, dirs, files in os.walk("./docs"):
         for f in files:
             if f.endswith(".rst"):
-                 tests.addTests(doctest.DocFileSuite(os.path.join(root, f)))
+                 tests.addTests(doctest.DocFileSuite(os.path.join(root, f),
+                                                  optionflags=doctest.ELLIPSIS))
 
     return tests