Add ability to specify custom node name in reclass.

In terms of PR to salt formula:
https://github.com/salt-formulas/salt-formula-salt/pull/44
I would like to introduce this changes in model.
diff --git a/salt/control/cluster/opencontrail_analytics_cluster.yml b/salt/control/cluster/opencontrail_analytics_cluster.yml
index 653f780..37fb60a 100644
--- a/salt/control/cluster/opencontrail_analytics_cluster.yml
+++ b/salt/control/cluster/opencontrail_analytics_cluster.yml
@@ -13,14 +13,17 @@
           engine: virt
           node:
             nal01:
+              name: ${_param:opencontrail_analytics_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
               size: opencontrail.analytics
             nal02:
+              name: ${_param:opencontrail_analytics_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
               size: opencontrail.analytics
             nal03:
+              name: ${_param:opencontrail_analytics_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
               size: opencontrail.analytics