+# to true, Puppet will purge all unmanaged entries from sources.list.d
+# update_timeout - Overrides the exec timeout in seconds for apt-get update.
+# If not set defaults to Exec's default (300)
+# update_tries - Number of times that `apt-get update` will be tried. Use this
+# to work around transient DNS and HTTP errors. By default, the command
+# will only be run once.