[jupyterhub] fix moving root home to /home

jupyterhub/base/Dockerfile

@@ -21,6 +21,8 @@ RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
     npm config set cache /var/cache/npm --global && \
     npm config set update-notifier false --global
 
+RUN sed -i -e 's|root:/root|root:/home|g' /etc/passwd
+
 ENV HOME=/home
 ENV XDG_DATA_HOME=/usr/local/share
 ENV IPYTHONDIR=/usr/local/etc/ipython