fix pylint in CI (#16540)

* fix pylint

* revert centos pylint

Author: roywei

Makefile

@@ -670,7 +670,7 @@ cpplint:
 	--exclude_path src/operator/contrib/ctc_include include/mkldnn
 
 pylint:
-	python3 -m pylint --rcfile=$(ROOTDIR)/ci/other/pylintrc --ignore-patterns=".*\.so$$,.*\.dll$$,.*\.dylib$$" python/mxnet tools/caffe_converter/*.py
+	python3 -m pylint --rcfile=$(ROOTDIR)/ci/other/pylintrc --ignore-patterns=".*\.so$$,.*\.dll$$,.*\.dylib$$" python/mxnet
 
 # Cython build
 cython: