[FIX] http, website_form: preserve form input values order

By default, werkzeug doesn't preserve the order
of the parameters sent to routes.

As stated in the werkzeug documentation:
```
parameter_storage_class

the class to use for args and form.
The default is an ImmutableMultiDict which supports multiple values per key.
alternatively it makes sense to use an ImmutableOrderedMultiDict
which preserves order or a ImmutableDict which is the fastest
but only remembers the last key.
It is also possible to use mutable structures, but this is not recommended.

New in version 0.6.

```

For some of our use cases, it makes sense to keep the order
of the route parameters.

e.g. In the website builder, when building a form
with a bunch of inputs values that will be concatened
in a lead note, the user expects the answer to be displayed
in the same order than the form inputs.

This change is seen as a bit risky as it could lead to
performances issues in the http routes processing, and this
is the reason we do not merge this in stable 9.0 at the moment.

If needed, it could be back ported later to 9.0, after
several weeks/months of testing in this release(saas-10 atm).

opw-677508

addons/website_form/controllers/main.py

@@ -22,7 +22,7 @@ class WebsiteForm(http.Controller):
             return json.dumps(False)
 
         try:
-            data = self.extract_data(model_record, ** kwargs)
+            data = self.extract_data(model_record, request.params)
         # If we encounter an issue while extracting data
         except ValidationError, e:
             # I couldn't find a cleaner way to pass data to an exception
@@ -101,7 +101,7 @@ class WebsiteForm(http.Controller):
 
 
     # Extract all data sent by the form and sort its on several properties
-    def extract_data(self, model, **kwargs):
+    def extract_data(self, model, values):
 
         data = {
             'record': {},        # Values to create record
@@ -112,7 +112,8 @@ class WebsiteForm(http.Controller):
         authorized_fields = model.sudo()._get_form_writable_fields()
         error_fields = []
 
-        for field_name, field_value in kwargs.items():
+
+        for field_name, field_value in values.items():
             # If the value of the field if a file
             if hasattr(field_value, 'filename'):
                 # Undo file upload field name indexing

openerp/http.py

@@ -770,9 +770,9 @@ class HttpRequest(WebRequest):
 
     def __init__(self, *args):
         super(HttpRequest, self).__init__(*args)
-        params = self.httprequest.args.to_dict()
-        params.update(self.httprequest.form.to_dict())
-        params.update(self.httprequest.files.to_dict())
+        params = collections.OrderedDict(self.httprequest.args)
+        params.update(self.httprequest.form)
+        params.update(self.httprequest.files)
         params.pop('session_id', None)
         self.params = params
 
@@ -1617,6 +1617,7 @@ class Root(object):
         try:
             httprequest = werkzeug.wrappers.Request(environ)
             httprequest.app = self
+            httprequest.parameter_storage_class = werkzeug.datastructures.ImmutableOrderedMultiDict
 
             explicit_session = self.setup_session(httprequest)
             self.setup_db(httprequest)