Add users to apex machine

They need to be able to login to apex to access any other machine from
the SSF rack.

m/common/ssf/hosts.nix

@@ -14,9 +14,9 @@
     "10.0.40.1" = [ "owl1" ];   "10.0.42.1" = [ "owl1-ib" ];   "10.0.40.101" = [ "owl1-ipmi" ];
     "10.0.40.2" = [ "owl2" ];   "10.0.42.2" = [ "owl2-ib" ];   "10.0.40.102" = [ "owl2-ipmi" ];
     "10.0.40.3" = [ "xeon03" ]; "10.0.42.3" = [ "xeon03-ib" ]; "10.0.40.103" = [ "xeon03-ipmi" ];
-    #"10.0.40.4" = [ "tent" ];   "10.0.42.4" = [ "tent-ib" ];   "10.0.40.104" = [ "tent-ipmi" ];
+    "10.0.40.4" = [ "xeon04" ]; "10.0.42.4" = [ "xeon04-ib" ]; "10.0.40.104" = [ "xeon04-ipmi" ];
     "10.0.40.5" = [ "koro" ];   "10.0.42.5" = [ "koro-ib" ];   "10.0.40.105" = [ "koro-ipmi" ];
-    "10.0.40.6" = [ "xeon06" ]; "10.0.42.6" = [ "xeon06-ib" ]; "10.0.40.106" = [ "xeon06-ipmi" ];
+    "10.0.40.6" = [ "tent" ];   "10.0.42.6" = [ "tent-ib" ];   "10.0.40.106" = [ "tent-ipmi" ];
     "10.0.40.7" = [ "hut" ];    "10.0.42.7" = [ "hut-ib" ];    "10.0.40.107" = [ "hut-ipmi" ];
     "10.0.40.8" = [ "eudy" ];   "10.0.42.8" = [ "eudy-ib" ];   "10.0.40.108" = [ "eudy-ipmi" ];
   };