Fix QoS selection for SRIOV environments

When QoS is set in the neutron-api charm, the neutron-openvswitch
charm needs to add 'extensions = qos' to the sriov_agent.ini
file.

Closes-bug: #1938277
Change-Id: I44fbf5991d2606161b1bcbc064d4bc68a2fbbb5b

hooks/neutron_ovs_utils.py

@@ -246,7 +246,8 @@ DPDK_RESOURCE_MAP = OrderedDict([
 SRIOV_RESOURCE_MAP = OrderedDict([
     (NEUTRON_SRIOV_AGENT_CONF, {
         'services': ['neutron-sriov-agent'],
-        'contexts': [neutron_ovs_context.OVSPluginContext()],
+        'contexts': [neutron_ovs_context.OVSPluginContext(),
+                     context.NeutronAPIContext()],
     }),
 ])
 

templates/kilo/sriov_agent.ini

@@ -9,3 +9,8 @@ firewall_driver = neutron.agent.firewall.NoopFirewallDriver
 [sriov_nic]
 physical_device_mappings = {{ sriov_device_mappings }}
 exclude_devices =
+
+{% if enable_sriov and enable_qos -%}
+[agent]
+extensions = qos
+{% endif -%}