Unhardcode baremetal-flat-network ip ranges

Allow to configure baremetal-flat-network cidr and
dhcp range via _param variables.
Add system model for neutron.gateway with ironic enabled.
Setup keystone admin_identity salt grains, used to create
openstack resources like neutron networks/subnets, ironic nodes.

Depends-On: I3f2db74e7e34310de19a44739828a874a5d5abac

Change-Id: I8bb529bf8b9ae2f115cbaa43beb16c819495d158
diff --git a/ironic/conductor/cluster.yml b/ironic/conductor/cluster.yml
index 43e870c..ba0c538 100644
--- a/ironic/conductor/cluster.yml
+++ b/ironic/conductor/cluster.yml
@@ -3,4 +3,4 @@
 parameters:
   ironic:
     conductor:
-      api_url: 'http://${_param:cluster_baremetal_vip_address}'
+      api_url: 'http://${_param:cluster_baremetal_vip_address}:6385'