[in jupyterhub tests] disable auth-by-default which was introduced in notebook PR #1831, and breaking tests :P
[in jupyterhub tests] disable auth-by-default
which was introduced in notebook PR #1831, and breaking tests :P

jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator