objects: stop conductor manager using dict field access on objects

The conductor manager 'object_action' method was accessing object
fields using dict syntax instead of attribute syntax. This meant
that every single object would always have to support dict compat
mode.

Change-Id: I7431b5d8e889eebacfef9179c9dceab54ac286ca
Merge "objects: stop conductor manager using dict field access on objects"