Make UI forms data accessible using $forms variable

When creating context, save the context to the '$forms'
variable as well as to '$'.  The 'S' contents may change
during evalation of collections and their methods but '$forms'
will remain the same.  This allows the forms data to be used
as input to a collection's method.

Change-Id: I4b32aa53cd7b56c07af7e593ead1736d81766ae7
Closes-Bug: 1700790

muranodashboard/dynamic_ui/services.py

@@ -126,6 +126,8 @@ class Service(object):
     def extract_attributes(self):
         context = self.context.create_child_context()
         context['$'] = self.cleaned_data
+        context['$forms'] = self.cleaned_data
+
         for name, template in six.iteritems(self.templates):
             context[name] = template
         if semantic_version.Version.coerce(self.spec_version) \