Resolve TMSS-146

TMSS-146: Closes TMSS-146

SAS/TMSS/docker/tmss-testenv/tmss_testenv_Dockerfile

@@ -21,7 +21,7 @@ ENV PATH=$PATH:/usr/pgsql-9.4/bin/
 RUN echo "Checking out code base" && \
     git clone https://git.astron.nl/ro/lofar.git && \
     cd lofar && \
-    git checkout master && \
+    git checkout TMSS-146 && \
     . CMake/gen_LofarPackageList_cmake.sh && \
     PACKAGE=TMSS  && \
     VARIANT=gnucxx11_opt  && \