We have _resolve_all_attributes merged for resource and
now 'show' attribute is present for every resource. So we don't
need to handle it as special case in format_resource_attributes
because all resolution logic will be handled in
_resolve_all_attributes and resolve_attributes.
Now resource-show always show the following:
- dict of all attributes and attribute values
- value for show attribute if this attribute resolved
Change-Id: Id514fe700e1cf2d879881b7f511f11b9f451cde3
4d370367a8