[MERGE] allow 'import bzrlib.plugins.NAME'

[Robert Collins]

This should be non-contentious: it just allows 'import
bzrlib.plugins.NAME' at any point after import bzrlib is performed.

This allows plugin X to depend on plugin Y, if Y has a predictable
name :).

No attempt is made to enforce naming policy or consistency.

There are two minor related changes.

One is that the zip entries on the path are now correctly scanned in
path order, rather than after all directories.

Secondly, plugins with names that are not legal python identifiers will
no longer load - and I consider this rather positive ;).

Rob
-- 
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