Tag recorded events with CORD version

Change-Id: I447f54dda7b8249bcbdfc8b9f20e71ce6a9dbd9f
diff --git a/scripts/cord-in-a-box.sh b/scripts/cord-in-a-box.sh
index 35415f7..e11a5f3 100755
--- a/scripts/cord-in-a-box.sh
+++ b/scripts/cord-in-a-box.sh
@@ -50,6 +50,8 @@
 
 function bootstrap() {
   echo "Generating build id"
+  rm -f /tmp/cord-build-version
+
   dd bs=18 count=1 if=/dev/urandom | base64 | tr +/ _. > /tmp/cord-build
   cd ~
   sudo apt-get update