Barbican adds unnecessary users to devstack install

[Dave McCowan]

When Barbican is installed with devstack, it creates the following extraneous users:

service-admin
project_a_admin
project_a_creator
project_a_creator_2
project_a_observer
project_a_auditor
project_b_admin
project_b_creator
project_b_observer
project_b_auditor

The users should only be created when running functional tests.
They should not be created for every devstack install.

Desired behavior:
Create these users as part of running functional tests.
Do not create these users as part of devstack install.

[Jeremy Liu (liujiong)]

Functional test will not be only running in devstack env, but also can be in a real OpenStack env.
So we may not require creating projects/roles/users when running functional tests. Instead, I think it's not that unnecessary to do the creating job in devstack installation. If people are using a devstack for development, it's convenient for them to run test locally without preparing the extra resources needed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/453829

[Grzegorz Grasza (xek)]

Closing out bugs created before migration to StoryBoard. Please re-open if you are of the opinion it is still current.