[MERGE][0.15][bug 93854] 'Branch.create_checkout' should copy the branch format

[John Arbash Meinel]

The Branch.create_checkout code was setting BzrDirFormat.branch_format,
but bzrdir was using BzrDirFormat._branch_format.

This patch adds interface tests for Branch.create_checkout() to make
sure that it works for all formats. Including being able to create
lightweight and heavy checkouts.

It then fixes the small bug.

John
=:->

PS> This is https://launchpad.net/bzr/+bug/93854
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