Add py3 req for get_db_with_content; remove unused imports.
Add py3 req for get_db_with_content; remove unused imports.

bgyori/indra,johnbachman/indra,johnbachman/belpy,johnbachman/belpy,sorgerlab/belpy,johnbachman/indra,pvtodorov/indra,sorgerlab/indra,pvtodorov/indra,bgyori/indra,bgyori/indra,sorgerlab/belpy,johnbachman/indra,pvtodorov/indra,sorgerlab/belpy,sorgerlab/indra,sorgerlab/indra,johnbachman/belpy,pvtodorov/indra