Refactor user creation function for debugging.

Signed-off-by: David Seaward <david.seaward@puri.sm>

cart/views.py

 from django import forms
+from django.contrib.auth import get_user_model
 from django.conf import settings
+from django.contrib.auth import authenticate, login
+from registration import signals
 from registration.backends.simple.views import RegistrationView
 from ldapregister.forms import RegistrationForm
 from captcha.fields import CaptchaField
 from cart.models import ChosenReward
 
+User = get_user_model()
+
 
 class CartRegistrationForm(RegistrationForm):
     captcha = CaptchaField()
@@ -27,7 +32,19 @@ class CartRegistrationView(RegistrationView):
         )
 
     def register(self, form):
-        usr = super().register(form)
-        reward = ChosenReward(user=usr, reward=self.reward)
+        # we ignore super().register(form) and replicate it here
+        new_user = form.save()
+
+        reward = ChosenReward(user=new_user, reward=self.reward)
         reward.save()
-        return usr
+
+        new_user = authenticate(
+            username=getattr(new_user, User.USERNAME_FIELD),
+            password=form.cleaned_data['password1']
+        )
+        login(self.request, new_user)
+        signals.user_registered.send(sender=self.__class__,
+                                     user=new_user,
+                                     request=self.request)
+
+        return new_user