Add a virshall

virshall can start, shutdown or destroy all VMs on a hypervisor LAB
so I can remove 'start' from create and pristine; sometimes it is useful
to only create (but not start) the LABs. Similarly, sometimes bringing
the LAB into pristine state, but without restarting the VMs, is useful.

virshall

@@ -0,0 +1,23 @@
+#!/bin/sh
+BUILD=${BUILD:=default}
+LAB=${LAB:=0}
+
+## Do not touch below this line
+LABDIR=/var/lab
+STAGING=$LABDIR/staging
+HVN="hvn${LAB}.lab.ipng.ch"
+CMD=$1
+
+[ "$CMD" != "start" -a "$CMD" != "shutdown" -a "$CMD" != "destroy" ] && {
+  echo "Usage: LAB=0 ./virshall start|shutdown|destroy"
+  exit
+}
+
+echo "*  Executing $CMD against all VMs on lab $LAB"
+ssh root@$HVN "set -x; for node in 0 1 2 3; do VM=vpp${LAB}-\${node}; virsh $CMD \$VM; done"
+
+[ "$CMD" = "start" ] && {
+  echo "*  Committing OVS config"
+  scp overlays/$BUILD/ovs-config.sh root@$HVN:$LABDIR
+  ssh root@$HVN "set -x; $LABDIR/ovs-config.sh"
+}