Update Dockerfile, checkout tmss version

docker/Dockerfile

@@ -184,8 +184,9 @@ RUN apt-get update -y && \
                           wget git  python3-nose python3-coverage \
                           python3-astropy
 
-RUN A=$CW; git clone https://git.astron.nl/ao/sdco/pyautoplot.git ${INSTALLDIR}/pyautoplot && \
+RUN A=$CX; git clone https://git.astron.nl/ao/sdco/pyautoplot.git ${INSTALLDIR}/pyautoplot && \
     cd ${INSTALLDIR}/pyautoplot && \
+    git checkout tmss && \
     python3 setup.py install