Revert "Showing member list for nested resources"

This reverts commit 5e883e94d73cb7fd6737c262f25cd7c6be56ffe5.

Reverted patch not fully resolve problem that was mentioned in bug
description, since presented in resource show ids are owned nested stack
and it doesn't allow use only resource-show command for displaying
information of these resources.
Also this code affects not only resource group resource, but other
nested resources too. So it leads to displaying some unwanted
information.

Conflicts:

	heat/tests/test_engine_service.py

Closes-bug: #1280391
Change-Id: Id965e1f872ebf63a510242c7c76a4f105dcb4a17
Merge "Revert "Showing member list for nested resources""