Allow setting oslo config opts from environment

Registered by Chris Dent on 2018-06-20

In certain orchestration environments, notably containers, it is common to set or override configuration from environment variables to avoid (or minimize) any files or other static artifacts that must be directly associated with the service being run. If we provide this functionality via oslo.config any OpenStack project can avail themselves of the functionality without needing special handling.

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Status:
Not started
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None
Priority:
Undefined
Drafter:
Chris Dent
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/config-from-environment,n,z

Addressed by: https://review.openstack.org/585850
    WIP: Add support for looking in environment for config

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