multi-primary key message in query._get() is busted

change is obvious from the diff. If one has a table with a multi-column primary key and you attempt to do a session.get(i) (i.e. pass in a scalar) or session.get((i,)) (i.e. pass in a tuple of the wrong length), the exception fails with an AttributeError (our session is instantiated with query_cls=CachingQuery but a similar error occurs in the distributed sqlalchemy)

"query.get(); primary key columns are %s" % ', '.join("'%s'" % c for c in q.mapper.primary_key)) AttributeError: 'CachingQuery' object has no attribute 'mapper'

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