[MERGE][#294479] Make InterPackRepo set the packer cache size even when there is stacking.

[John Arbash Meinel]

John Arbash Meinel has voted comment.
Status is now: Semi-approved
Comment:
I thought we had discussed this in Sydney, and felt that a better 
solution was to do the caching in the Transport layer, so that it can 
sync the stream when a read is called.

That said, I'm not opposed to getting something which works before we do 
the optimal solution.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C20081112233139.GA28617%40steerpike.home.puzzling.org%3E
Project: Bazaar