nova: Drop xen remnants

Xen support in Nova has been dropped cycles ago.

Change-Id: Ieb52291529eb0d94206b3f30195c4d2527c9dc52

Author: mnasiadka

docker/nova/nova-libvirt/Dockerfile.j2

@@ -78,8 +78,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
     {% if base_arch in ['aarch64', 'x86_64'] %}
         {% set nova_libvirt_packages = nova_libvirt_packages + [
-            'dmidecode',
-            'xen-utils'
+            'dmidecode'
         ] %}
     {% endif %}
 

docker/nova/nova-libvirt/extend_start.sh

@@ -1,10 +1,5 @@
 #!/bin/bash
 
-# Mount xenfs for libxl to work
-if [[ $(lsmod | grep xenfs) ]]; then
-    mount -t xenfs xenfs /proc/xen
-fi
-
 if [[ ! -e "/var/log/kolla/libvirt/libvirtd.log" ]]; then
     mkdir -p /var/log/kolla/libvirt
     touch /var/log/kolla/libvirt/libvirtd.log