updated around security changes

Change-Id: I6b1a0af141cbc3b50b8ed935cfe144a68a283d1d
diff --git a/config/sample.yml b/config/sample.yml
index 07db51e..5736385 100644
--- a/config/sample.yml
+++ b/config/sample.yml
@@ -88,5 +88,11 @@
   #  - dell_apt_repo="deb [arch=amd64] http://10.1.0.1:8889/mirror/linux.dell.com/repo/community trusty openmanage"
   #  - juju_apt_repo="deb [arch=amd64] http://10.1.0.1:8889/mirror/ppa.launchpad.net/juju/stable/ubuntu trusty main"
 
+# If passwords are not set, random passwords will be generated
+passwords:
+  #compute_node: ubuntu
+  #maas_admin: admin
+  #maas_user: cord
+
 docker:
   imageVersion: candidate