SW-592: Change lofar-base Docker image to use v3.3.0 tag of DAL

Docker/lofar-base/Dockerfile.tmpl

@@ -137,7 +137,7 @@ RUN apt-get update && apt-get install -y subversion swig ruby ruby-dev python-de
 #
 RUN apt-get update && apt-get install -y git cmake g++ swig python-dev libhdf5-dev && \
     mkdir ${INSTALLDIR}/DAL && \
-    cd ${INSTALLDIR}/DAL && git clone https://github.com/nextgen-astrodata/DAL.git src && cd src && git checkout master && cd .. && \
+    cd ${INSTALLDIR}/DAL && git clone --branch v3.3.0 https://github.com/nextgen-astrodata/DAL.git src && \
     mkdir ${INSTALLDIR}/DAL/build && cd ${INSTALLDIR}/DAL/build && cmake -DCMAKE_INSTALL_PREFIX=${INSTALLDIR}/DAL ../src && \
     make -j ${J} && \
     make install && \