Update a few type ignore comments (#8767)

Some are no longer needed and other's comments are out of date.

For the changes to the acme nonce errors, `Exception` doesn't take kwargs. The error message about this our own classes isn't super helpful:
```
In [2]: BadNonce('nonce', 'error', foo='bar')                                                                                                                                                                                                                                                                               
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-54555658ef99> in <module>
----> 1 BadNonce('nonce', 'error', foo='bar')

TypeError: __init__() got an unexpected keyword argument 'foo'
```
but if you try this on `Exception` which these classes inherit from, you get:
```
In [4]: Exception(foo='bar')                                                                                                                                                                                                                                                                                                
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-028b924f74c5> in <module>
----> 1 Exception(foo='bar')

TypeError: Exception() takes no keyword arguments
```
See https://github.com/python/typeshed/pull/2348 for more info.

* remove outdated ignores

* update locking ignore comment

* don't accept kwargs

1 files changed, 4 insertions, 10 deletions

diff --git a/acme/acme/errors.py b/acme/acme/errors.py
index 5ca5a4fa2..84b7704dc 100644
--- a/acme/acme/errors.py
+++ b/acme/acme/errors.py
@@ -28,13 +28,8 @@ class NonceError(ClientError):
 
 class BadNonce(NonceError):
     """Bad nonce error."""
-    def __init__(self, nonce, error, *args, **kwargs):
-        # MyPy complains here that there is too many arguments for BaseException constructor.
-        # This is an error fixed in typeshed, see https://github.com/python/mypy/issues/4183
-        # The fix is included in MyPy>=0.740, but upgrading it would bring dozen of errors due to
-        #   new types definitions. So we ignore the error until the code base is fixed to match
-        #   with MyPy>=0.740 referential.
-        super(BadNonce, self).__init__(*args, **kwargs)  # type: ignore
+    def __init__(self, nonce, error, *args):
+        super(BadNonce, self).__init__(*args)
         self.nonce = nonce
         self.error = error
 
@@ -52,9 +47,8 @@ class MissingNonce(NonceError):
     :ivar requests.Response ~.response: HTTP Response
 
     """
-    def __init__(self, response, *args, **kwargs):
-        # See comment in BadNonce constructor above for an explanation of type: ignore here.
-        super(MissingNonce, self).__init__(*args, **kwargs)  # type: ignore
+    def __init__(self, response, *args):
+        super(MissingNonce, self).__init__(*args)
         self.response = response
 
     def __str__(self):