Fixed #8244: Modified the temporary directory used by file storage tests so...

>>> from django.core.files.storage import FileSystemStorage

>>> from django.core.files.base import ContentFile

>>> temp_storage = FileSystemStorage(location=tempfile.gettempdir())

# Set up a unique temporary directory

>>> import os

>>> temp_dir = tempfile.mktemp()

>>> os.makedirs(temp_dir)

>>> temp_storage = FileSystemStorage(location=temp_dir)

# Standard file access options are available, and work as expected.

...             number += 1

...

...         return name

>>> custom_storage = CustomStorage(tempfile.gettempdir())

>>> custom_storage = CustomStorage(temp_dir)

>>> first = custom_storage.save('custom_storage', ContentFile('custom contents'))

>>> first

>>> custom_storage.delete(first)

>>> custom_storage.delete(second)

# Cleanup the temp dir

>>> os.rmdir(temp_dir)

"""

# Tests for a race condition on file saving (#4948).