Monkey patch DexterityContent.__getattr__:

This is required to support dynamic lookup of schema-level default values for
fields in behaviors. It basically is a backport of this Dexterity 2.x fix:
https://github.com/plone/plone.dexterity/commit/dd491480b869bbe21ee50ef413c263705af7b170
Bump og.document upgrade step 2702 to 2703

in order to make room for the missing upgrade step
following in the next commit.
Add missing upgrade step to add IDocumentMetadata

behavior to opengever.document FTI.
Merge pull request #344 from 4teamwork/lg_missing_upgrade_step_for_metadata_extraction

Add missing upgrade step for metadata extraction