Use ‘exclude list’ instead of ‘blacklist’ (#4297)

This replaces all uses of ‘blacklist’ with ‘exclude list’. Benefits:

- It is racially neutral terminology; see e.g. [1]

- It makes the meaning more clear. In fact, with the popular Python
  autoformatter called ‘black’, also used by this project, files can be
  ‘blackened’ which is something completely different from them being on
  a blacklist.

[1] https://chromium.googlesource.com/chromium/src/+/master/styleguide/inclusive_code.md#racially-neutral

tests/mypy_test.py

@@ -39,9 +39,9 @@ def log(args, *varargs):
         print(*varargs)
 
 
-def match(fn, args, blacklist):
-    if blacklist.match(fn):
-        log(args, fn, 'exluded by blacklist')
+def match(fn, args, exclude_list):
+    if exclude_list.match(fn):
+        log(args, fn, 'exluded by exclude list')
         return False
     if not args.filter and not args.exclude:
         log(args, fn, 'accept by default')
@@ -80,8 +80,8 @@ def libpath(major, minor):
 def main():
     args = parser.parse_args()
 
-    with open(os.path.join(os.path.dirname(__file__), "mypy_blacklist.txt")) as f:
-        blacklist = re.compile("(%s)$" % "|".join(
+    with open(os.path.join(os.path.dirname(__file__), "mypy_exclude_list.txt")) as f:
+        exclude_list = re.compile("(%s)$" % "|".join(
             re.findall(r"^\s*([^\s#]+)\s*(?:#.*)?$", f.read(), flags=re.M)))
 
     try:
@@ -112,7 +112,7 @@ def main():
                 if mod in seen or mod.startswith('.'):
                     continue
                 if ext in ['.pyi', '.py']:
-                    if match(full, args, blacklist):
+                    if match(full, args, exclude_list):
                         seen.add(mod)
                         files.append(full)
                 elif (os.path.isfile(os.path.join(full, '__init__.pyi')) or
@@ -124,7 +124,7 @@ def main():
                             m, x = os.path.splitext(f)
                             if x in ['.pyi', '.py']:
                                 fn = os.path.join(r, f)
-                                if match(fn, args, blacklist):
+                                if match(fn, args, exclude_list):
                                     seen.add(mod)
                                     files.append(fn)
         if files: