Use unix socket to connect libvirt in nova

The motivation is to remove 127.0.0.1 in connection_uri and so
can allow live migration in libvirtd.
Plus, realize tls on libvirt to secure.
Now /run is already mounted so it should work

Depends-On: https://review.opendev.org/752263
Change-Id: I911abb8b1ee1e300d02a373e083a404574cc3fea

nova/Chart.yaml

@@ -14,7 +14,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Nova
 name: nova
-version: 0.1.10
+version: 0.1.11
 home: https://docs.openstack.org/nova/latest/
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Nova/OpenStack_Project_Nova_vertical.png
 sources:

nova/values.yaml

@@ -1725,7 +1725,7 @@ conf:
       auth_type: password
       send_service_user_token: false
     libvirt:
-      connection_uri: "qemu+tcp://127.0.0.1/system"
+      connection_uri: "qemu+unix:///system?socket=/run/libvirt/libvirt-sock"
       images_type: qcow2
       images_rbd_pool: vms
       images_rbd_ceph_conf: /etc/ceph/ceph.conf

releasenotes/notes/nova.yaml

@@ -11,3 +11,4 @@ nova:
   - 0.1.8 Change Issuer to ClusterIssuer
   - 0.1.9 Revert "Change Issuer to ClusterIssuer"
   - 0.1.10 Use HostToContainer mount propagation
+  - 0.1.11 Secure libvirt connection from using 127.0.0.1 to use unix socket