drop validate_* with datatypes in write_network

Author: bastelfreak

manifests/plugin/write_network.pp

@@ -1,13 +1,11 @@
 # A define to make a generic network output for collectd
 class collectd::plugin::write_network (
-  $ensure  = 'present',
-  $servers = { 'localhost'  =>  { 'serverport' => '25826' } },
+  $ensure       = 'present',
+  Hash $servers = { 'localhost'  =>  { 'serverport' => '25826' } },
 ) {
 
   include ::collectd
 
-  validate_hash($servers)
-
   $servernames = keys($servers)
   if empty($servernames) {
     fail('servers cannot be empty')