[patch] bzrtools should not append to DEFAULT_IGNORE

[Aaron Bentley]

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John Arbash Meinel wrote:
> The attached patch is a fix for bzrtools to avoid the current
> DEPRECATION warnings that we get since my ignore changes landed.

I've now applied this to bzrtools dev.  Of course, I'll still defer to
Micheal's solution when he adjusts the Shelf upstream.

Aaron
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