Add lab-build snippets and executing them in 'create'. Refactor create/destroy/pristine; also, only virsh destroy VMs if they are 'running'

build/default/hvn1.lab.ipng.ch/host1-0/root/lab-build/disable-vpp

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+echo " * Disabling VPP, Bird and FRR"
+for i in vpp vppcfg bird-dataplane frr; do
+  ln -sf /dev/null /etc/systemd/system/multi-user.target.wants/${i}.service
+done

build/default/hvn1.lab.ipng.ch/host1-0/root/lab-build/perms

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo " * Fixing permissions"
+chown -R root. /root/
+chown -R ipng. /home/ipng/

build/default/hvn1.lab.ipng.ch/host1-0/root/lab-build/test

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+echo "Testing build snippets"
+date