Fixed python3 errors

Modified `network` > `networks`. Also fixed Python3 `TypeError: string indices must be integers` dict error.

proxmox.py

@@ -205,10 +205,9 @@ class ProxmoxAPI(object):
         ip_address = None
         networks = self.get('api2/json/nodes/{0}/qemu/{1}/agent/network-get-interfaces'.format(node, vm))['result']
         if networks:
-            if type(network) is dict:
+            if type(networks) is dict:
                 for network in networks:
-                    for address in network['ip-addresses']:
-                        ip_address = address['ip-address']
+                    for ip_address in ['ip-address']:
                          try:
                              # IP address validation
                              if socket.inet_aton(ip_address):