base: generate en_US.UTF-8 locale data for Debian/Ubuntu systems

Change-Id: Id2463692f5a633b6e50af6e7ce6e3f49612e4c5d
Closes-bug: #1852452

docker/base/Dockerfile.j2

@@ -395,6 +395,9 @@ COPY apt_preferences /etc/apt/preferences.d/kolla-custom
         {% endfor %}
     {% endblock %}
 RUN apt-get update \
+    && apt-get -y install locales \
+    && sed -e "s/# $LANG UTF-8/$LANG UTF-8/g" /etc/locale.gen -i \
+    && locale-gen "$LANG" \
     && apt-get -y upgrade \
     && apt-get -y dist-upgrade \
     && apt-get -y install --no-install-recommends \