Added missing docs to DiscoverRunner for keepdb option; refs #20550.

selection of other methods that are used to by ``run_tests()`` to set up,

execute and tear down the test suite.

.. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=True, **kwargs)

.. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=True, keepdb=False **kwargs)

    ``DiscoverRunner`` will search for tests in any file matching ``pattern``.

    If ``failfast`` is ``True``, the test suite will stop running after the

    first test failure is detected.

    If ``keepdb`` is ``True``, the test suite will use the existing database,

    or create one if necessary. If ``False``, a new database will be created,

    prompting the user to remove the existing one, if present.

    Django may, from time to time, extend the capabilities of the test runner

    by adding new arguments. The ``**kwargs`` declaration allows for this

    expansion. If you subclass ``DiscoverRunner`` or write your own test

        subclassed test runner to add options to the list of command-line

        options that the :djadmin:`test` command could use.

        The ``keepdb`` argument was added.

Attributes

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