Add ability to configure retention policy

Create new parameters on manifest, then apply
them to storage template.

Change-Id: Ia8fc17bb970d28bdfa80ed19cee6b44364dfc9c0

manifests/init.pp

@@ -5,6 +5,23 @@ class graphite(
   $graphite_admin_user = '',
   $graphite_admin_email = '',
   $graphite_admin_password = '',
+  $storage_schemas = [
+    {
+      'name'       => 'carbon',
+      'pattern'    => '^carbon\.',
+      'retentions' => '60:90d',
+    },
+    {
+      'name'       => 'stats',
+      'pattern'    => '^stats.*',
+      'retentions' => '10s:8h,60s:7d,1h:1y,1d:5y',
+    },
+    {
+      'name'       => 'default',
+      'pattern'    => '.*',
+      'retentions' => '60:90d',
+    }
+  ],
 ) {
   $packages = [ 'python-django',
                 'python-django-tagging',

templates/storage-schemas.conf.erb

@@ -7,14 +7,9 @@
 
 # Carbon's internal metrics. This entry should match what is specified in
 # CARBON_METRIC_PREFIX and CARBON_METRIC_INTERVAL settings
-[carbon]
-pattern = ^carbon\.
-retentions = 60:90d
+<% @storage_schemas.each do |schema| -%>
+["<%= schema['name'] %>"]
+pattern = <%= schema['pattern'] %>
+retentions = <%= schema['retentions'] %>
 
-[stats]
-pattern = ^stats.*
-retentions = 10s:8h,60s:7d,1h:1y,1d:5y
-
-[default]
-pattern = .*
-retentions = 60:90d
+<% end -%>