Point collectd df at "/", "/mnt", and "/data/travis" on travis-worker…

… hosts

worker_host/travis_worker_collectd/recipes/ec2-docker.rb

@@ -8,16 +8,11 @@
   options :interface => %w[eth0 docker0]
 end
 
-collectd_plugin "df" do
-  options :mount_point => "/",
-          :report_reserved => false,
-          :report_inodes => false,
-          :values_percentage => true
-end
-
-collectd_plugin "df" do
-  options :mount_point => "/mnt",
-          :report_reserved => false,
-          :report_inodes => false,
-          :values_percentage => true
+%w[/ /mnt /data/travis].each do |mount_point|
+  collectd_plugin "df" do
+    options :mount_point => mount_point,
+            :report_reserved => false,
+            :report_inodes => false,
+            :values_percentage => true
+  end
 end