Update base RBAC API test case to also insert system user with admin permission.
Update base RBAC API test case to also insert system user with admin
permission.

nzlosh/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,Plexxi/st2,StackStorm/st2,Plexxi/st2,nzlosh/st2