cleanup mirror-image

Change-Id: Iba39ddce46cff01e41e34b8c26970bc3cb46ff48
diff --git a/mirror-image/scripts/cleanup.sh b/mirror-image/scripts/cleanup.sh
index 01dd605..295d4cb 100644
--- a/mirror-image/scripts/cleanup.sh
+++ b/mirror-image/scripts/cleanup.sh
@@ -6,7 +6,8 @@
 rm -f /usr/sbin/policy-rc.d || true
 
 echo "cleaning up hostname"
-sed -i "/.*ubuntu-1604.*/d" /etc/hosts
+sed -i "/.*ubuntu.*/d" /etc/hosts
+sed -i "/.*salt.*/d" /etc/hosts
 
 echo "cleaning up guest additions"
 rm -rf VBoxGuestAdditions_*.iso VBoxGuestAdditions_*.iso.? || true