[MERGE] Roll back the overly big fix to bug 304841, allowing _fetch order to move to RepositoryFormat.

[Robert Collins]

This removes _part_ of the fix made for bug 304841, but not all of it.
The test case for the bug is still present (and passes).

This part of the fix is not necessary (and wouldn't be sufficient
anyway). It's not sufficient because inserting into a stacked repository
on the server side can't see the fallback repositories; and its not
necessary because we can ensure correct behaviour without this.

'knit' repositories do not stack at all, and pack repositories are
atomic so the ordering does not matter.

In a follow up I'm moving the _fetch flags for fetching off Repository
down to RepositoryFormat, because these flags represent the physical
capabilities of the repository.

-Rob
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