support/docker: drop Python 2.x modules

Since commit 4a40d36f13
("support/testing: switch to Python 3 only") our runtime testing
infrastructure is Python 3.x only.

Therefore, it is no longer needed to have python-nose2 and
python-pexpect in the Docker container used to run our Gitlab CI jobs.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 23f7fa874b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/docker/Dockerfile

@@ -36,8 +36,6 @@ RUN apt-get install -y --no-install-recommends \
         libncurses5-dev \
         locales \
         mercurial \
-        python-nose2 \
-        python-pexpect \
         python3 \
         python3-flake8 \
         python3-nose2 \