Monty Taylor b9872da5f0
Make sure security_groups is always a list
In https://github.com/ansible/ansible/issues/24675 we see that sometimes
security_groups is coming back None. The data model in shade says it's a
list, so make sure it is one.

Change-Id: I6db45ba7c3d630812ea58353d3eaddbb98cb8c1f
2017-05-17 12:15:43 -05:00
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