Remove test test_create_delete_server_group_with_multiple_policies

Bug 1324348 has been resolved, and it prevented nova from accepting
duplicated policies, so this test should be removed.

And, the negative test cases for this has been added to nova project
nova/tests/unit/api/openstack/compute/test_server_groups.py
test_create_server_group_with_duplicate_policies
test_create_server_group_conflicting_policies

Change-Id: Ida9a7143234aa4f41a72987d2b8d0d8d179041c5
1 file changed