added fluentd::filter definition

manifests/filter.pp

@@ -0,0 +1,14 @@
+# Configure a fluentd filter
+#
+define fluentd::filter (
+  $ensure   = present,
+  $priority = 20,
+  $pattern  = '',
+  $config   = {},
+) {
+  fluentd::config::file { "filter-${title}":
+    ensure   => $ensure,
+    priority => $priority,
+    content  => template( 'fluentd/filter.erb'),
+  }
+}

templates/filter.erb

@@ -0,0 +1,13 @@
+<filter <%= @pattern %>>
+<% @config.each do |key, val| -%>
+    <%- if val.is_a?( Hash ) -%>
+        <<%= key -%>>
+        <%- val.each do |key, val| -%>
+            <%= key -%> <%= val %>
+        <%- end -%>
+        </<%= key %>>
+    <%- else -%>
+        <%= key -%> <%= val %>
+    <%- end -%>
+<% end -%>
+</filter>