[MERGE] Avoid unnecessarily resolving lazy objects in Registry.get_prefix().

[John Arbash Meinel]

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Jelmer Vernooij wrote:
> This patch makes Registry.get_prefix() not load objects until it has found a 
> key that matches. Registry.get_prefix() is used by the directory services code,
> which because of this currently loads all registered directory services, even 
> if they are not used. 
> 
> On my system, this means not having to always load some parts of the launchpad 
> and builddeb plugins including their dependencies (xmlrpc, apt_pkg).
> 
> Cheers,
> 
> Jelmer
> 

BB:approve

John
=:->

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