Add linux-cloud-tools to expected azure packages

Fixes #453

Author: s4heid

bosh-stemcell/spec/assets/dpkg-list-ubuntu-azure-additions.txt

@@ -1,5 +1,9 @@
 azure-vm-utils
 cloud-init
+linux-cloud-tools-5.15
+linux-cloud-tools-5.15-generic
+linux-cloud-tools-common
+linux-cloud-tools-generic
 netplan.io
 python-is-python3
 python3-attr