[MERGE][#250418] make bzrdir.clone_on_transport pass on stacked_on_pwd

[Michael Hudson]

Michael Hudson wrote:
> Attempting a stacking-preserving clone on a branch that stacked on
> another branch by a relative URL didn't work (bug 250418 on Launchpad,
> "bzr_dir_for_branch_stacked_on_relative_url.clone('...',
> preserve_stacking=True) miscalculates stacked-on URL").  The attached
> one-line fix and 50-odd lines of test changes fixes this.  The bundle
> includes and depends on my change to rebase_url posted a couple of hours
> ago.
> 
> Cheers,
> mwh
> 

Here's an update that changes the stacking tests of clone (including the
one I added) to raise TestNotApplicable when stacking is not supported.

Cheers,
mwh
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