HADOOP-15610. Fixed pylint version for Hadoop docker image.

               Contributed by Jack Bearden

dev-support/docker/Dockerfile

@@ -154,9 +154,10 @@ RUN apt-get -q update && apt-get -q install -y shellcheck
 RUN apt-get -q update && apt-get -q install -y bats
 
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-# Install pylint (always want latest)
+# Install pylint at fixed version (2.0.0 removed python2 support)
+# https://github.com/PyCQA/pylint/issues/2294
 ####
-RUN pip2 install pylint
+RUN pip2 install pylint==1.9.2
 
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 # Install dateutil.parser