Enable no-name-in-module pylint check

Enable no-name-in-module pylint check

Add _MovedItems (from six.moves) to pylintrc ignored-modules, and adjust
one import of sqlalchemy.orm.properties.RelationshipProperty.

s.o.p.RelationshipProperty is created at import-time in a rather
exciting manner - rearranging the import in this way forces the
import-time code to be executed and seems sufficient to satisfy the
pylint static check.

Change-Id: Ic99dc2b7dfac75930a5c446ae899eaae09ee6174