Make debugger doctest more remote.

Depending on whether or not __main__ is set to a real module, there may
or may not be a 'File: ' line in the pinfo output. This differs
according to whether tests were run directly or via a subprocess using
'python -c', so we use the doctest ellipsis to ignore the difference.

IPython/core/tests/test_debugger.py

@@ -117,7 +117,7 b' def test_ipdb_magics():'
     ipdb> pinfo a
     Type:       ExampleClass
     String Form:ExampleClass()
-    Namespace:  Locals
+    Namespace:  Local...
     Docstring:  Docstring for ExampleClass.
     Constructor Docstring:Docstring for ExampleClass.__init__
     ipdb> continue