Set libvirt live_migration_uri

Sets up n-cpu to migrate domains via SSH.  By default, hosts attempt
to connect to each other as root, so this specifies STACK_USER instead.

Change-Id: Ic6e868091c89a2cc6b2f0fada3f7e95002aaff8b
diff --git a/lib/nova_plugins/hypervisor-libvirt b/lib/nova_plugins/hypervisor-libvirt
index 259bf15..53dbfb9 100644
--- a/lib/nova_plugins/hypervisor-libvirt
+++ b/lib/nova_plugins/hypervisor-libvirt
@@ -42,6 +42,7 @@
     iniset $NOVA_CONF libvirt virt_type "$LIBVIRT_TYPE"
     iniset $NOVA_CONF libvirt cpu_mode "none"
     iniset $NOVA_CONF libvirt use_usb_tablet "False"
+    iniset $NOVA_CONF libvirt live_migration_uri "qemu+ssh://$STACK_USER@%s/system"
     iniset $NOVA_CONF DEFAULT default_ephemeral_format "ext4"
     iniset $NOVA_CONF DEFAULT compute_driver "libvirt.LibvirtDriver"
     LIBVIRT_FIREWALL_DRIVER=${LIBVIRT_FIREWALL_DRIVER:-"nova.virt.libvirt.firewall.IptablesFirewallDriver"}