[MERGE] Conversion to rich-root updates inventory sha1s

[Aaron Bentley]

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Hi all,

This patch is a follow-up of my earlier patch to make conversion from
non-rich-root to rich-root *work*.  Now it's time to make it right.

First, I moved the fetch tests out of test_interrepository, into their
own file.

Next, I ensured that the inventory_sha1 field of revisions is always
updated by Repository.add_revision, not just some of the time.

Finally, I ensured that all relevant converters and bundle formats were
using Repository.add_revision.

This means that a revision's inventory_sha1 should always match the
actual stored inventory's sha1.

Work remains to make this conversion fast, and to allow revisions
updated via reconcile.

Aaron
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