Use userid < 65535, so that it also works in unprivileged LXC containers

Dockerfile

@@ -54,7 +54,7 @@ path=/var/www/console/htdocs\n\
 port=8000\n\
 ' > /etc/dt/dt_host.ini
 
-RUN groupadd -g 80000 consoledemo && useradd -g consoledemo -M -u 80000 consoledemo
+RUN groupadd -g 27790 consoledemo && useradd -g consoledemo -M -u 27790 consoledemo
 RUN mkdir -p /var/log/dt/traces && chown consoledemo.consoledemo /var/log/dt/traces
 RUN chown -R consoledemo.consoledemo /var/www/console/htdocs/tle