Fix cyclic dependency with Horde_Db_Base_Adapter binder

Fix cyclic dependency with Horde_Db_Base_Adapter binder

Horde_Db (optionally) uses both cache and/or logger objects. However,
these objects can themselves use Horde_Db. Thus, to init these objects,
the Horde_Db object must have already been instantiated. These objects
cannot be passed to Horde_Db at construct time - they must be added in
afterwards.