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/keystone/client/service/ironic.yml b/keystone/client/service/ironic.yml
index 7635e2c..beb99a1 100644
--- a/keystone/client/service/ironic.yml
+++ b/keystone/client/service/ironic.yml
@@ -12,6 +12,14 @@
                   is_admin: true
                   password: ${_param:keystone_ironic_password}
                   email: ${_param:admin_email}
+        admin_identity:
+          admin:
+            user: admin
+            password: ${_param:keystone_admin_password}
+            project: admin
+            host: ${_param:keystone_service_host}
+            port: 5000
+            region_name: ${_param:openstack_region}
           service:
             ironic:
               type: baremetal