[MERGE] Batch get_parent_map HPSS calls made from InterRepo._walk_to_common_revisions

[John Arbash Meinel]

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Comment:
tweak pending knowing whether the code block should be outside the while 
loop or not.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C20081001114920.GA20027%40steerpike.home.puzzling.org%3E
Project: Bazaar