OSTF proxy will not work in missing controller role case

Registered by Nastya Urlapova

Converted from https://bugs.launchpad.net/fuel/+bug/1470923:
Right now OSTF uses http_proxy for all API calls. This settings based on controller role.
But Fuel can use another roles and controller can absent in customer configuration.
In this case setup of proxy will be failed and all networks (public, management) will be unavailable.
It should be redesigned.

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Status:
Not started
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None
Priority:
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Drafter:
Nastya Urlapova
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Needs approval
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None
Definition:
New
Series goal:
None
Implementation:
Unknown
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