Update the nova inventory plugin with new ip code

The provisioning module knows more about how nova deals with IP
addresses now. Ensure that the inventory module is similarly as smart
by separating out the logic into the openstack/module_utils.

lib/ansible/module_utils/openstack.py

@@ -54,3 +54,16 @@ def openstack_argument_spec():
     else:
         spec['login_tenant_name'] = dict(required=True)
     return spec
+
+
+def openstack_find_nova_addresses(addresses, ext_tag, key_name=None):
+
+    ret = []
+    for (k, v) in addresses.iteritems():
+        if key_name and k == key_name:
+            ret.extend([addrs['addr'] for addrs in v])
+        else:
+            for interface_spec in v:
+                if 'OS-EXT-IPS:type' in interface_spec and interface_spec['OS-EXT-IPS:type'] == ext_tag:
+                    ret.append(interface_spec['addr'])
+    return ret