fix: set owner/group to defaults

- defaults set via hiera, works over multiple OS's

manifests/key.pp

@@ -4,7 +4,7 @@ define bind::key (
     $secret      = undef,
     $secret_bits = 256,
     $algorithm   = 'hmac-sha256',
-    $owner       = 'bind',
+    $owner       = $::bind::defaults::bind_user,
     $group       = $::bind::defaults::bind_group,
     $keydir      = $::bind::keydir::keydir,
     $keyfile     = undef,

manifests/keydir.pp

@@ -2,11 +2,13 @@
 
 class bind::keydir (
     $keydir,
+    $owner = $::bind::defaults::bind_user,
+    $group = $::bind::defaults::bind_group,
 ) {
     file { $keydir:
         ensure => directory,
         mode   => '0755',
-        owner  => 'bind',
-        group  => 'bind',
+        owner  => $owner,
+        group  => $group,
     }
 }