settings.py: Change deployed check

This is security-critical so we have two checks.

(imported from commit adaa1cefe2d08526cdaac2fb0d8cc02773390224)

humbug/settings.py

@@ -2,7 +2,8 @@
 import os
 import platform
 
-deployed = (platform.node() == 'humbug-dev')
+deployed = (('humbughq.com' in platform.node())
+            or os.path.exists('/etc/humbug-server'))
 
 DEBUG = not deployed
 TEMPLATE_DEBUG = DEBUG

servers/puppet/manifests/site.pp

@@ -86,6 +86,14 @@ class humbug_base {
     source     => '/root/humbug/servers/puppet/files/root_authorized_keys',
   }
 
+  # This is just an empty file.  It's used by the app to test if it's running
+  # in production.
+  file { '/etc/humbug-server':
+    ensure     => file,
+    mode       => 644,
+    source     => '/root/humbug/servers/puppet/files/humbug-server',
+  }
+
   file { '/etc/puppet/puppet.conf':
     ensure     => file,
     mode       => 640,