[Bug 1380792] Fix proposed to nova (stable/juno)

[OpenStack Infra]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/130342

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https://bugs.launchpad.net/bugs/1380792

Title:
  requests to EC2 metadata's '/2009-04-04/meta-data/security-groups'
  failing

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