Add the kosmos_kvm recipe and the firewall rules

... to the KVM hosts, centaurus and draco

Refs #244

nodes/centaurus.kosmos.org.json

@@ -81,6 +81,10 @@
     "role[gitea]",
     "role[postgresql_replica]",
     "role[discourse]",
-    "role[drone]"
+    "role[drone]",
+    "recipe[kosmos_kvm]",
+    "recipe[kosmos-ejabberd::firewall]",
+    "recipe[kosmos-postgresql::firewall_replicas]",
+    "recipe[kosmos_zerotier::firewall]"
   ]
-}
+}