Make qemu use nova user

Ubuntu cloud archive released libvirt-bin version 2.5.0 which runs vms as
libvirt-qemu user. We need to force qemu to use this user to be able to
access vm files.

Change-Id: I47ff3e3b3f9412734bdc662f14681850bf64d53f
Closes-bug: 1714421

libvirt/templates/etc/_libvirtd.conf.tpl

@@ -17,6 +17,6 @@ limitations under the License.
 listen_tcp = 1
 auth_tcp = "none"
 ca_file = ""
-log_level = {{ .Values.libvirt.log_level }}
-log_outputs = "{{ .Values.libvirt.log_level }}:stderr"
-listen_addr = "{{ .Values.libvirt.listen_addr }}"
+log_level = {{ .Values.conf.libvirt.log_level }}
+log_outputs = "{{ .Values.conf.libvirt.log_level }}:stderr"
+listen_addr = "{{ .Values.conf.libvirt.listen_addr }}"

libvirt/templates/etc/_qemu.conf.tpl

@@ -28,3 +28,5 @@ limitations under the License.
 #          rollover when a size limit is hit.
 #
 stdio_handler = "file"
+{{ if not .Values.conf.qemu.user }}#{{ end }}user = {{ .Values.conf.qemu.user | default "nova" | quote }}
+{{ if not .Values.conf.qemu.group }}#{{ end }}group = {{ .Values.conf.qemu.group | default "kvm" | quote }}

libvirt/values.yaml

@@ -29,7 +29,6 @@ images:
   libvirt: docker.io/kolla/ubuntu-source-nova-libvirt:3.0.3
   pull_policy: "IfNotPresent"
 
-
 ceph:
   enabled: true
   monitors: []
@@ -37,9 +36,13 @@ ceph:
   cinder_keyring: null
   secret_uuid: 457eb676-33da-42ec-9a8c-9293d545c337
 
-libvirt:
-  listen_addr: 0.0.0.0
-  log_level: 3
+conf:
+  libvirt:
+    listen_addr: 0.0.0.0
+    log_level: 3
+  qemu:
+    user: "nova"
+    group: "kvm"
 
 pod:
   affinity: