vici: Use OrderedDict to handle vici responses in Python library

The default Python dictionaries are unordered, but order is important for some
vici trees (for example the order of authentication rounds).

src/libcharon/plugins/vici/python/vici/protocol.py

@@ -3,6 +3,7 @@ import socket
 import struct
 
 from collections import namedtuple
+from collections import OrderedDict
 
 from .exception import DeserializationException
 
@@ -150,13 +151,13 @@ class Message(object):
                     "Expected end of list at {pos}".format(pos=stream.tell())
                 )
 
-        section = {}
+        section = OrderedDict()
         section_stack = []
         while stream.has_more():
             element_type, = struct.unpack("!B", stream.read(1))
             if element_type == cls.SECTION_START:
                 section_name = decode_named_type(stream)
-                new_section = {}
+                new_section = OrderedDict()
                 section[section_name] = new_section
                 section_stack.append(section)
                 section = new_section