Don't populate expired attrs w/ evaluator

Don't populate expired attrs w/ evaluator

Fixed bug in :meth:`_orm.Query.update` where objects in the
:class:`_orm.Session` that were already expired would be unnecessarily
SELECTed individually when they were refreshed by the "evaluate"
synchronize strategy.

For 1.4 there was also a similar issue with fetch that would actually
get the wrong data back, as the new value would be loaded, then
applied with the evaluator.

Fixes: #5664
Change-Id: I6e6aff88462654fcefa9fce2b45f5446c418deee