Modernize template syntax

Change-Id: I1ef305f1e1d4bcca7a47049882a06ea732700062

templates/openstackwatch.ini.erb

@@ -2,35 +2,35 @@
 
 [general]
 # only show certain projects (don't forget the openstack/ as start)
-projects = <%= projects.join(", ") %>
+projects = <%= @projects.join(", ") %>
 
 # The Json URL where is the gerrit system.
-json_url = <%= json_url %>
+json_url = <%= @json_url %>
 
 # Allow different mode to output to swift, by default 'combined' will
 # combined all rss in one and 'multiple' will upload all the projects
 # in each rss file.
-output_mode = <%= mode %>
+output_mode = <%= @mode %>
 
 # username to your swift cluster
 [swift]
 # username/tenant for swift with 2.0 or just username with 1.0 (i.e:
 # RAX).
-username = <%= swift_username %>
+username = <%= @swift_username %>
 
 # password or api key
-password = <%= swift_password %>
+password = <%= @swift_password %>
 
 # container to upload (probably want to be public)
-container = <%= container %>
+container = <%= @container %>
 
 # auth_url of the cluster, for Rackspace this is :
 # https://auth.api.rackspacecloud.com/v1.0
 # or Rackspace UK :
 # https://lon.auth.api.rackspacecloud.com/v1.0
-auth_url = <%= swift_auth_url %>
+auth_url = <%= @swift_auth_url %>
 
 # auth version (1.0 for Rackspace clouds, 2.0 for keystone backend clusters)
-auth_version = <%= auth_version %>
+auth_version = <%= @auth_version %>
 
 # vim: ft=dosini