Set VIRSH_DEFAULT_CONNECT_URI in Ironic scripts

Ironic setup scripts that interface with virsh should default to always
connecting to the 'qemu:///system' URI.  Adds LIBVIRT_CONNECT_URI that
ends up exported as VIRSH_DEFAULT_CONNECT_URI in scripts that require
it.

Change-Id: Ib660bd51a8c7bfe96e14aab4b6d3a6e83a5a4220
diff --git a/tools/ironic/scripts/create-nodes b/tools/ironic/scripts/create-nodes
index 3232b50..d81113a 100755
--- a/tools/ironic/scripts/create-nodes
+++ b/tools/ironic/scripts/create-nodes
@@ -27,6 +27,9 @@
 
 LIBVIRT_NIC_DRIVER=${LIBVIRT_NIC_DRIVER:-"e1000"}
 LIBVIRT_STORAGE_POOL=${LIBVIRT_STORAGE_POOL:-"default"}
+LIBVIRT_CONNECT_URI=${LIBVIRT_CONNECT_URI:-"qemu:///system"}
+
+export VIRSH_DEFAULT_CONNECT_URI=$LIBVIRT_CONNECT_URI
 
 if ! virsh pool-list --all | grep -q $LIBVIRT_STORAGE_POOL; then
     virsh pool-define-as --name $LIBVIRT_STORAGE_POOL dir --target /var/lib/libvirt/images >&2