fix the vms turn transient after libvirt pod restarts

After libvirt pod restarts, the virtual machines created before
turn transient ,then opetrate these vms ,nova-compute will throw
exception. This is because that the directory /etc/libivrt/qemu
in pod contains vitual machines xml files and it is temporary,
the xmls files disappear after the pod restarts, so we mount it
to hostpath /etc/libvirt/qemu.

Change-Id: I48fd712c2b0565cb2cfe850482e8501f4e5022a4
Closed-bug: 1760003

libvirt/templates/daemonset-libvirt.yaml

@@ -109,6 +109,8 @@ spec:
               mountPath: /etc/libvirt/qemu.conf
               subPath: qemu.conf
               readOnly: true
+            - name: etc-libvirt-qemu
+              mountPath: /etc/libvirt/qemu
             - mountPath: /lib/modules
               name: libmodules
               readOnly: true
@@ -179,5 +181,8 @@ spec:
         - name: machine-id
           hostPath:
             path: /etc/machine-id
+        - name: etc-libvirt-qemu
+          hostPath:
+            path: /etc/libvirt/qemu
 {{ if $mounts_libvirt.volumes }}{{ toYaml $mounts_libvirt.volumes | indent 8 }}{{ end }}
 {{- end }}