Sagi Shnaidman ea3e29b540 Make image path for tempest configurable
Testing image must be configurable in tempest config scripts.
Set it default for temporary github mirror until
1713358 is resolved.
Related-Bug: #1713358

Change-Id: Idc979d60e7ed5d36646d2a9c3fd41e5f85ee15ca
2017-08-29 00:51:01 +03:00
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