HADOOP-17718. Explicitly set locale in the Dockerfile. (#3034)

Reviewed-by: Akira Ajisaka <[email protected]>
(cherry picked from commit ad923ad)

Conflicts:
	dev-support/docker/Dockerfile_centos_7
	dev-support/docker/Dockerfile_centos_8
(cherry picked from commit 5e09d38)

Conflicts:
	dev-support/docker/Dockerfile_aarch64

Author: jojochuang

dev-support/docker/Dockerfile

@@ -85,6 +85,10 @@ RUN apt-get -q update \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
+RUN locale-gen en_US.UTF-8
+ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
+ENV PYTHONIOENCODING=utf-8
+
 ######
 # Set env vars required to build Hadoop
 ######