Log Message:
py-django: updated to 1.11.8

Django 1.11.8 fixes several bugs in 1.11.7:
* Reallowed, following a regression in Django 1.10, AuthenticationForm to raise \ 
the inactive user error when using ModelBackend.
* Added support for QuerySet.values() and values_list() for union(), \ 
difference(), and intersection() queries.
* Fixed incorrect index name truncation when using a namespaced db_table.
* Made QuerySet.iterator() use server-side cursors on PostgreSQL after values() \ 
and values_list().
* Fixed crash on SQLite and MySQL when ordering by a filtered subquery that uses \ 
nulls_first or nulls_last.
* Made query lookups for CICharField, CIEmailField, and CITextField use a citext \ 
cast.
* Fixed a regression in caching of a GenericForeignKey when the referenced model \ 
instance uses multi-table inheritance.
* Fixed “Cannot change column ‘x’: used in a foreign key constraint” \ 
crash on MySQL with a sequence of AlterField and/or RenameField operations in a \ 
migration