Add libvirt-driver-lxc to nova-libvirt

libvirt is compiled with lxc support.  On Ubuntu hosts, without this file
libvirt is nonusable.  The container exits immediately.

Change-Id: Ifbc2d75defe082cbe3b80b1821799f1f965c2a85

docker/nova-compute/nova-libvirt/Dockerfile

@@ -4,6 +4,7 @@ MAINTAINER Kolla Project (https://launchpad.net/kolla)
 RUN yum -y install libvirtd libguestfs qemu-system-x86 \
         libvirt-daemon-driver-nwfilter \
         libvirt-daemon-config-nwfilter \
+        libvirt-daemon-driver-lxc \
         && yum clean all
 
 VOLUME [ "/sys/fs/cgroup" ]