Keystone has stopped providing or reffering `_member_` role for a while,
thus role should not be refferenced anymore.
Moreover, with 2023.1 service policies have dropped `_member_`
which resulted in the role to be insufficient for basic operations.
Change-Id: I4d6eacae2041b0a00114dda4e8315d4ec6295319
Related-Bug: #2029486