Remove a sub test case under dovetail.tempest.tc004

Remove a sub test case under dovetail.tempest.tc004

- Fixed vping, ha, sdnvpn test case names to match test specs
- Removed aliases from VIM operations and matched test case
name changes in patch https://gerrit.opnfv.org/gerrit/#/c/47691/4
- CVP to OVP name change

- A test case was removed from tempest tc004 because of the Tempest
version from 15 to 14. A reference to it was still in this doc.

Change-Id: If2e07e15b48ae6bca5ac0e262aead784cd67cd0f
Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>