[MERGE] Fix exception when ScopeReplacer is assigned to before retrieving any members

[John Arbash Meinel]

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Aaron Bentley wrote:
> Hi all,
> 
> This patch fixes the bug Adeodato Simò observed.  This is a corner-case
> bug, to be sure, as it only happens when the first operation on a module
> or package is assignment.
> 
> But it was exposed by Bzrtools, which emits a warning from its own
> run_argv_aliases, and this caused
> bzrlib.commands.option._verbosity_level to be set before any members of
> bzrlib.commands.option had been retrieved.
> 
> Aaron

The only thing I would say, is that we should probably test that:

+        test_obj6.bar = 'test'
+        self.assertNotEqual(lazy_import.ScopeReplacer,
+                            object.__getattribute__(test_obj6, '__class__'))

         self.assertEqual('test', test_obj6.bar)

Just to make sure that the attribute is actually set. Otherwise:

BB:tweak

John
=:->
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