Fix assert logic in test_list_security_groups_list_all_tenants_filter

In test_list_security_groups_list_all_tenants_filter, when testing
"Fetch all security groups for non-admin user", the following check
is not correct, it can't check "all created Security Groups are
present in fetched list", but can only check that "no other user's
Security Groups can be retrieved by non-admin user."
This is to fix the check statements.

Change-Id: I4781a3450385a66df53c437791ac6b107d8efe7e
1 file changed