Add option to disable default zone inclusion

By setting bind::include_default_zones to false, a user can suppress the
inclusion of the default definitions for the root hints zone and RFC 1912
zones. These are supplied with the BIND package's default configuration on both
Debian and RedHat derived systems. These zones are necessary for a resolver,
but may be omitted if the server acts strictly as an authoritative server.

manifests/init.pp

@@ -7,8 +7,8 @@ class bind (
     $rndc                  = undef,
     $statistics_port       = undef,
     $auth_nxdomain         = false,
-    $include_local         = false,
     $include_default_zones = true,
+    $include_local         = false,
 ) inherits bind::defaults {
 
     File {
@@ -62,7 +62,7 @@ class bind (
         content => template('bind/named.conf.erb'),
     }
 
-    if $default_zones_source {
+    if $include_default_zones and $default_zones_source {
         file { $default_zones_include:
             source => $default_zones_source,
         }

manifests/view.pp

@@ -13,6 +13,7 @@ define bind::view (
 ) {
     $confdir = $::bind::confdir
     $default_zones_include = $::bind::default_zones_include
+    $include_default_zones = $::bind::include_default_zones
 
     concat::fragment { "bind-view-${name}":
         order   => $order,