Merge pull request #5 from chamankang/UCLOUDNG-282

UCLOUDNG-282 : quantum-metadata-agent automation
UCLOUDNG-293 : Nova VIF driver should be linuxbridge
Merge pull request #6 from chamankang/UCLOUDNG-293

UCLOUDNG-293 : Nova VIF driver should be linuxbridge
UCLOUDNG-282 : quantum-metadata-agent automation