dns: Make dns_cache a class-level variable.

NEWS

 unreleased (??)
 
+    [dns] Make dns_cache a class-level parameter, so that it can be set in 
+    Hiera (as base::dns::dns_cache) (akkornel)
+
     [dns] Add support for Livermore, via Hiera.  Set base::dns::livermore (in 
     Hiera) to true, and Livermore DNS gets added to resolv.conf (akkornel)
 

manifests/dns.pp

@@ -4,15 +4,21 @@
 # resolv.conf file.  This is helpful in DHCP environments.
 # To enable, use Hiera to set base::dns::no_resolv_conf to "true".
 
+# If you use a DNS cache, you can change base::dns::dns_cache in Hiera to true, 
+# and 127.0.0.1 will be set as the first nameserver.
+
 # For Livermore sites, change base::dns::livermore to true, and the Livermore
-# DNS server will be added above the standard DNS servers.
+# DNS server will be added above the standard DNS servers.  If dns_cache is 
+# also true, Livermore DNS will be second (right below 127.0.0.1).
 class base::dns(
   $no_resolv_conf = false,
+  $dns_cache      = 'NONE',
   $livermore      = false,
 ) {
   if !$no_resolv_conf {
     base::dns::resolv_conf { $::fqdn_lc:
       ensure    => present,
+      dns_cache => $dns_cache,
       livermore => $livermore,
     }
   }