hosts: Decommission node-refrain.k.p.b

I did something stupid to this machine trying to clear up its
`/var/lib/containers/storage` volume and now it won't start any new
pods.  Killing it and replacing.

hosts

@@ -105,7 +105,6 @@ stor-rentable.k8s.pyrocufflink.black
 node-abreast.k8s.pyrocufflink.black
 node-gleaming.k8s.pyrocufflink.black
 node-hatbox.k8s.pyrocufflink.black
-node-refrain.k8s.pyrocufflink.black
 
 [k8s-node:children]
 k8s-longhorn