Selectively suppress and enable broad-except lint

.pylintrc

@@ -26,7 +26,6 @@ notes=FIXME,XXX
 #TODO: Enable cyclic-import
 #TODO: Enable redefined-outer-name
 #TODO: Enable too-many-instance-attributes
-#TODO: Enable broad-except
 #TODO: Enable too-many-locals
 #TODO: Enable too-many-lines
 #TODO: Enable redefined-variable-type
@@ -37,4 +36,4 @@ notes=FIXME,XXX
 #TODO: Enable too-many-nested-blocks
 #TODO: Enable super-init-not-called
 
-disable=missing-docstring,too-few-public-methods,too-many-arguments,no-init,duplicate-code,invalid-name,suppressed-message,locally-disabled,protected-access,no-name-in-module,unused-argument,wrong-import-order,cyclic-import,redefined-outer-name,too-many-instance-attributes,broad-except,too-many-locals,too-many-lines,redefined-variable-type,next-method-called,import-error,useless-else-on-loop,too-many-return-statements,too-many-nested-blocks,super-init-not-called
+disable=missing-docstring,too-few-public-methods,too-many-arguments,no-init,duplicate-code,invalid-name,suppressed-message,locally-disabled,protected-access,no-name-in-module,unused-argument,wrong-import-order,cyclic-import,redefined-outer-name,too-many-instance-attributes,too-many-locals,too-many-lines,redefined-variable-type,next-method-called,import-error,useless-else-on-loop,too-many-return-statements,too-many-nested-blocks,super-init-not-called

src/python/grpcio/grpc/_auth.py

@@ -44,7 +44,7 @@ def _create_get_token_callback(callback):
     def get_token_callback(future):
         try:
             access_token = future.result().access_token
-        except Exception as exception:
+        except Exception as exception:  # pylint: disable=broad-except
             _sign_request(callback, None, exception)
         else:
             _sign_request(callback, access_token, None)

src/python/grpcio/grpc/_channel.py

@@ -200,7 +200,7 @@ def _consume_request_iterator(request_iterator, state, call,
                 request = next(request_iterator)
             except StopIteration:
                 break
-            except Exception:
+            except Exception:  # pylint: disable=broad-except
                 logging.exception("Exception iterating requests!")
                 call.cancel()
                 _abort(state, grpc.StatusCode.UNKNOWN,

src/python/grpcio/grpc/_plugin_wrapping.py

@@ -67,8 +67,8 @@ class _WrappedCygrpcCallback(object):
     def _invoke_success(self, metadata):
         try:
             cygrpc_metadata = _common.cygrpc_metadata(metadata)
-        except Exception as error:
-            self._invoke_failure(error)
+        except Exception as exception:  # pylint: disable=broad-except
+            self._invoke_failure(exception)
             return
         self.cygrpc_callback(cygrpc_metadata, cygrpc.StatusCode.ok, b'')