[MERGE] Policy-based repository acquisition

[Aaron Bentley]

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Hi all,

This patch is part of my work on supporting remote policies for stacking.

It implements policy-based repository creation, and lays the groundwork
for policy-based stacking configuration.

It basically rearranges BzrDir._find_or_create_repository drastically so
that the BzrDir can control more policy decisions than only whether to
create a repository.  The rearrangement was necessary to avoid
multiplying the number of server roundtrips required to determine the
policy.

BzrDir.clone_on_transport is used by "bzr push" to create its branches,
so it was the natural first place to implement this policy.

Aaron
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