cinder/volume.pp: Bind iSCSI portal to management IP, not to wildcard

If Cinder binds its iSCSI portal to the 0.0.0.0 address, then Nova
will attempt to connect (with iscsiadm) to a portal at 0.0.0.0, which
is obviously bogus.

Instead, bind to the IP of the management interface, so iscsiadm can
properly access the portal.

manifests/cinder/volume.pp

@@ -19,7 +19,7 @@ class kickstack::cinder::volume inherits kickstack {
         require => Physical_volume["$pv"]
       }
       class { '::cinder::volume::iscsi': 
-        iscsi_ip_address => '0.0.0.0',
+        iscsi_ip_address => getvar("ipaddress_${nic_management}"),
         require => Volume_group["$vg"]
       }
     }