Multiple hypervisor driver support for nova

Change-Id: I84a7c817dec17175eb1a5cda64ba9e5056c57e50
Implements: blueprint nova-multiple-drivers

docker/nova/nova-compute/Dockerfile.j2

@@ -21,7 +21,8 @@ RUN apt-get install -y --no-install-recommends \
         ceph-common \
         ironic-common \
         python-ironicclient \
-    && apt-get clean
+    && apt-get clean \
+    && rm -f /etc/nova/nova-compute.conf
 
     {% endif %}
 {% elif install_type == 'source' %}

docker/nova/nova-libvirt/Dockerfile.j2

@@ -23,6 +23,7 @@ RUN apt-get install -y --no-install-recommends \
         qemu \
         qemu-block-extra \
         ebtables \
+        xen-utils \
     && apt-get clean \
     && mkdir -p /etc/ceph \
     && rm /etc/libvirt/qemu/networks/default.xml /etc/libvirt/qemu/networks/autostart/default.xml

docker/nova/nova-libvirt/extend_start.sh

@@ -8,6 +8,11 @@ if [[ -c /dev/kvm ]]; then
     chown root:kvm /dev/kvm
 fi
 
+# Mount xenfs for libxl to work
+if [[ $(lsmod | grep xenfs) ]]; then
+    mount -t xenfs xenfs /proc/xen
+fi
+
 if [[ ! -d "/var/log/kolla/nova" ]]; then
     mkdir -p /var/log/kolla/nova
 fi