[MERGE] Upgrade ConfigObj to version 4.5.1

[Matt Nordhoff]

Aaron Bentley wrote:
> Matt Nordhoff wrote:
>> Aaron Bentley wrote:
>>> bb:approve
>>>
>>> I think the latest version (revno 3228) is fine.  Will submit.  But
>>> let's see if we can get the getattr change into the upstream.
>> Does this mean it's my responsibility to get the getattr change upstream?
> 
> Not your obligation, but if you could do that, it would be great.

Ok. I'll see about that.
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