Run eager loaders on unexpire

Run eager loaders on unexpire

Eager loaders, such as joined loading, SELECT IN loading, etc., when
configured on a mapper or via query options will now be invoked during
the refresh on an expired object; in the case of selectinload and
subqueryload, since the additional load is for a single object only,
the "immediateload" scheme is used in these cases which resembles the
single-parent query emitted by lazy loading.

Change-Id: I7ca2c77bff58dc21015d60093a88c387937376b2
Fixes: #1763