Fixes KeyError in floating ip unit test

Patch 118478 introduced security group create buttons respecting quotas. This
unit test needs to have the security group quota available for quotas to
avoid the KeyError.

Change-Id: I3214fa1e383b9520ac2bb963e41d0163d45acd62
Closes-bug: 1381073
Merge "Fixes KeyError in floating ip unit test"