Test OpenStack vGPU feature

Test OpenStack vGPU feature

XCI will be able to deploy this feature
on top of pharos lab with GPU so we have test it

This test can be improved in the future with OpenCL tests etc

|        DEPLOY_SCENARIO        |       os-nosdn-vgpu-ha     |

+-------------------+-------------------+------------------+----------------+
|     TEST CASE     |      PROJECT      |     DURATION     |     RESULT     |
+-------------------+-------------------+------------------+----------------+
|        vgpu       |      functest     |      01:00       |      PASS      |
+-------------------+-------------------+------------------+----------------+

Change-Id: I50618f47097a0257b1834b3966054d20458715df
Signed-off-by: Valentin Boucher <valentin.boucher@kontron.com>