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/cleanup-nodes b/tools/ironic/scripts/cleanup-nodes
index dc5a19d..adeca5c 100755
--- a/tools/ironic/scripts/cleanup-nodes
+++ b/tools/ironic/scripts/cleanup-nodes
@@ -8,10 +8,13 @@
 set -exu
 
 LIBVIRT_STORAGE_POOL=${LIBVIRT_STORAGE_POOL:-"default"}
+LIBVIRT_CONNECT_URI=${LIBVIRT_CONNECT_URI:-"qemu:///system"}
 
 VM_COUNT=$1
 NETWORK_BRIDGE=$2
 
+export VIRSH_DEFAULT_CONNECT_URI=$LIBVIRT_CONNECT_URI
+
 for (( idx=0; idx<$VM_COUNT; idx++ )); do
     NAME="baremetal${NETWORK_BRIDGE}_${idx}"
     VOL_NAME="baremetal${NETWORK_BRIDGE}-${idx}.qcow2"