add placeholder for atom authentication

Reference: /n/atom/patch/applied/atomauth
Date: Sun Jan  5 01:30:10 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /lib/ndb/local	Sun Jan  5 01:29:28 2014
+++ /lib/ndb/local	Sun Jan  5 01:29:29 2014
@@ -11,6 +11,7 @@
 auth=sources.cs.bell-labs.com authdom=outside.plan9.bell-labs.com
 auth=ladd.quanstro.net authdom=plan9.quanstro.net
 auth=tyty.coraid.com authdom=coraid.com
+auth=atom.9atom.org authdom=9atom.org
 
 #
 #  because the public demands the name localhost