Calculate usage of network based on ipv4 subnets only

Author: mdujava

Diff for: osia/installer/clouds/openstack.py

@@ -100,7 +100,12 @@ def _find_fit_network(osp_connection: Connection,
     results = {}
     for net_name in networks:
         net_avail = osp_connection.network.get_network_ip_availability(named_networks[net_name])
-        results[net_name] = net_avail['total_ips'] / net_avail['used_ips']
+        total_ips = 0
+        used_ips = 0
+        for subnet in filter(lambda x: x['ip_version'] == 4, net_avail.subnet_ip_availability):
+            total_ips += subnet['total_ips']
+            used_ips += subnet['used_ips']
+        results[net_name] = total_ips / used_ips
     result = _find_best_fit(results)
     return named_networks[result]['id'], result