Open Stack

There have been a number of changes in tempest recently that seem to 
coordinate with devstack that are a bit unclear.

The following values are defined in tempest config as defaults:

[auth]
# Roles to assign to all users created by tempest (list value)
#tempest_roles =

[object-storage]
# Role to add to users created for swift tests to enable creating
# containers (string value)
#operator_role = Member

[orchestration]
# Role required for users to be able to manage stacks (string value)
#stack_owner_role = heat_stack_owner

These are the values created in tempest.conf by devstack:

[auth]

tempest_roles = Member


[orchestration]
stack_owner_role = _member_

So a couple of questions.

Why do we have Member and _member_, and what is the difference supposed 
to be?

Experimentally, it seems that the tempest roles cannot be empty, so why 
is that the default?

The heat_stack_owner role used to be created in juno devstack but no 
longer. Is there a reason to leave this as the default?

Any explanations appreciated !

  -David


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