Fix heat template for cassandra

Reasons:
 - heat template for cassandra misses OS::Neutron::Port resource which is 
   required for NICs that can be applied to an instance.

Changes:
 - adding OS::Neutron::Port cassandra heat template.

Change-Id: I9661ae5d6e0695b7fd56d97cc6cd6ab874a3b5d0
Closes-Bug: #1308131

trove/templates/cassandra/heat.template

@@ -18,6 +18,16 @@ Parameters:
   TenantId:
     Type: String
 Resources:
+{% for port in ports %}
+  {{ port.name }}:
+    Type: OS::Neutron::Port
+    Properties:
+      network_id: "{{ port.net_id }}"
+      security_groups: [{Ref: CassandraDbaasSG}]
+      {% if port.fixed_ip %}
+      fixed_ips: [{"ip_address": "{{ port.fixed_ip }}"}]
+      {% endif %}
+{% endfor %}
   BaseInstance:
     Type: AWS::EC2::Instance
     Metadata: