Added a missing import from [8186].

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8187 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/__init__.py

@@ -8,6 +8,7 @@ def autodiscover():
     not present. This forces an import on them to register any admin bits they
     may want.
     """
+    import imp
     from django.conf import settings
     for app in settings.INSTALLED_APPS:
         try: