Deploy a script to create new VMs

It uses `virt-install` with the official Ubuntu 20.04 cloud image as a
starting point, with cloud-init to add our SSH keys to the ubuntu user
and set up Zerotier.

USAGE: create_vm VMNAME

Closes #244

site-cookbooks/kosmos_kvm/.gitignore

@@ -0,0 +1,22 @@
+.vagrant
+*~
+*#
+.#*
+\#*#
+.*.sw[a-z]
+*.un~
+
+# Bundler
+Gemfile.lock
+gems.locked
+bin/*
+.bundle/*
+
+# test kitchen
+.kitchen/
+kitchen.local.yml
+
+# Chef
+Berksfile.lock
+.zero-knife.rb
+Policyfile.lock.json