Fix the unittest use wrong controller for SecurityGroups V2

V2.1 and V2 API are sharing some set of unittest. But the unittest
for SecurityGroups V2 use the wrong controller. This patch fixes this.

Change-Id: I03cc6f3e4c1985fd961378d819c032f7a7c3d8ba
Merge "Fix the unittest use wrong controller for SecurityGroups V2"