Trigger automatic redirection updates on GetImage and SourceValidate (v2)

[ville.syrjala at nokia.com]

Added the TraverseTree revert, and the src==dst SourceValidate patch
to the series.

I also reoragnized the patchset so that patches 1-4 can be applied as a
quick fix. Patch 5 is then just an additional optimization to limit the
updates to a specific subtree.

Patch 6 could be taken independently.