server: validate IP address

Add IP validation after input parsing.

cli/objects/server.py

@@ -24,6 +24,11 @@ class OgServer():
                             required=True,
                             help='valid ogserver ip address')
         parsed_args = parser.parse_args(args)
+
+        if not check_address(parsed_args.address):
+            print(f'Invalid IP address: {parsed_args.address}')
+            return
+
         payload = {'address': parsed_args.address}
         rest.post('/server', payload=payload)