RFC: deprecate 'root' on inventory.

[Robert Collins]

Currently, the root entry in an inventory is a little odd - its the only
entry addressable by name. I'd like to remove it, and instead have just 
'root_id' instead.

So code that does 'inv.root.file_id' would do 'inv.root_id', and code
that actually needs the root entry specifically would do
inv[inv.root_id]. 

This seems to fit better with demand loading inventories.

Thoughts?

-Rob
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