bpo-41521: Rename blacklist parameter to not_exported (GH-21824)

Rename "blacklist" parameter of test.support.check__all__() to
"not_exported".
diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
index 4bf7248..4ef20db 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -2257,22 +2257,19 @@
             tarfile.itn(0x10000000000, 6, tarfile.GNU_FORMAT)
 
     def test__all__(self):
-        blacklist = {'version', 'grp', 'pwd', 'symlink_exception',
-                     'NUL', 'BLOCKSIZE', 'RECORDSIZE', 'GNU_MAGIC',
-                     'POSIX_MAGIC', 'LENGTH_NAME', 'LENGTH_LINK',
-                     'LENGTH_PREFIX', 'REGTYPE', 'AREGTYPE', 'LNKTYPE',
-                     'SYMTYPE', 'CHRTYPE', 'BLKTYPE', 'DIRTYPE', 'FIFOTYPE',
-                     'CONTTYPE', 'GNUTYPE_LONGNAME', 'GNUTYPE_LONGLINK',
-                     'GNUTYPE_SPARSE', 'XHDTYPE', 'XGLTYPE', 'SOLARIS_XHDTYPE',
-                     'SUPPORTED_TYPES', 'REGULAR_TYPES', 'GNU_TYPES',
-                     'PAX_FIELDS', 'PAX_NAME_FIELDS', 'PAX_NUMBER_FIELDS',
-                     'stn', 'nts', 'nti', 'itn', 'calc_chksums', 'copyfileobj',
-                     'filemode',
-                     'EmptyHeaderError', 'TruncatedHeaderError',
-                     'EOFHeaderError', 'InvalidHeaderError',
-                     'SubsequentHeaderError', 'ExFileObject',
-                     'main'}
-        support.check__all__(self, tarfile, blacklist=blacklist)
+        not_exported = {
+            'version', 'grp', 'pwd', 'symlink_exception', 'NUL', 'BLOCKSIZE',
+            'RECORDSIZE', 'GNU_MAGIC', 'POSIX_MAGIC', 'LENGTH_NAME',
+            'LENGTH_LINK', 'LENGTH_PREFIX', 'REGTYPE', 'AREGTYPE', 'LNKTYPE',
+            'SYMTYPE', 'CHRTYPE', 'BLKTYPE', 'DIRTYPE', 'FIFOTYPE', 'CONTTYPE',
+            'GNUTYPE_LONGNAME', 'GNUTYPE_LONGLINK', 'GNUTYPE_SPARSE',
+            'XHDTYPE', 'XGLTYPE', 'SOLARIS_XHDTYPE', 'SUPPORTED_TYPES',
+            'REGULAR_TYPES', 'GNU_TYPES', 'PAX_FIELDS', 'PAX_NAME_FIELDS',
+            'PAX_NUMBER_FIELDS', 'stn', 'nts', 'nti', 'itn', 'calc_chksums',
+            'copyfileobj', 'filemode', 'EmptyHeaderError',
+            'TruncatedHeaderError', 'EOFHeaderError', 'InvalidHeaderError',
+            'SubsequentHeaderError', 'ExFileObject', 'main'}
+        support.check__all__(self, tarfile, not_exported=not_exported)
 
 
 class CommandLineTest(unittest.TestCase):