feat(instances): a VM's network devices as cards, each with its QoS limits

Settings > Network was a table whose fields were read-only inputs cut
off at phone width, an unlabelled "+", three icon buttons per NIC and
a separate QoS table keyed by MAC. The owner chose card layout from
three rendered options, with the QoS limits folding out like the
device details:

- A card per NIC: a VM's only NIC spans the row, two or more sit side
  by side from md. Each has its name and target, the link state as a
  switch, its source and IPv4 addresses, and "Device details"
  (type, MAC, model, NWFilter, IPv6) in a <details>.
- "QoS limits" in a second <details>, its summary naming the limited
  directions: a form per inbound or outbound limit, with Save and
  Delete limit, and the units.
- Labelled Edit, Add QoS and Delete in the card footer; "Add network
  device" by the heading. The edit and add-QoS dialogs are titled and
  labelled, and the edit dialog's fields have labels.

The limits come from each NIC of the persistent definition, so the QoS
table, Instance.config_qos and wvmInstance.get_all_qos are removed.

vrtManager/tests/test_device_edits.py

@@ -110,10 +110,8 @@ class DeviceEditsTestCase(unittest.TestCase):
             p._defineXML.assert_called_once()
             p.wvm.defineXML.assert_not_called()
 
-    def test_qos_is_read_from_either_definition_and_an_edit_keeps_the_floor(self):
+    def test_a_qos_edit_keeps_the_floor(self):
         p = proxy()
-        self.assertEqual(p.get_all_qos(config=True)["52:54:10:00:00:01"][0]["floor"], "4")
-        self.assertEqual(p.get_all_qos(), {})  # the running VM has none
         p.set_qos("52:54:10:00:00:01", "inbound", 10, 20, 30)
         inbound = defined(p).find("devices/interface[@type='network']/bandwidth/inbound")
         self.assertEqual(inbound.attrib, {"average": "10", "peak": "20", "burst": "30", "floor": "4"})