Use site-agnostic default parameter values

Set the default snmp hosts to the empty set rather than
cacti.openstack.org.

Change-Id: Ibae45af594fc2b18024fcc2d6ef040afd4ddd926
Depends-On: I173ca1efae4644c89cfab68d6beeba0a1dae9ce2

manifests/init.pp

@@ -14,8 +14,8 @@ class iptables(
   $rules6           = [],
   $public_tcp_ports = [],
   $public_udp_ports = [],
-  $snmp_v4hosts     = ['104.239.135.208'],
-  $snmp_v6hosts     = ['2001:4800:7819:104:be76:4eff:fe05:1d6a'],
+  $snmp_v4hosts     = [],
+  $snmp_v6hosts     = [],
 ) {
 
   include ::iptables::params