SW-612: Build casacore for Python3 and not for Python2

Docker/lofar-base/Dockerfile.tmpl

@@ -62,7 +62,7 @@ RUN apt-get update && apt-get install -y wget git cmake g++ gfortran flex bison
     if [ "${CASACORE_VERSION}" != "latest" ]; then cd ${INSTALLDIR}/casacore/src && git checkout tags/v${CASACORE_VERSION}; fi && \
     cd ${INSTALLDIR}/casacore/data && wget --retry-connrefused ftp://ftp.astron.nl/outgoing/Measures/WSRT_Measures.ztar && \
     cd ${INSTALLDIR}/casacore/data && tar xf WSRT_Measures.ztar  && rm -f WSRT_Measures.ztar && \
-    cd ${INSTALLDIR}/casacore/build && cmake -DCMAKE_INSTALL_PREFIX=${INSTALLDIR}/casacore/ -DDATA_DIR=${INSTALLDIR}/casacore/data -DBUILD_PYTHON=True -DENABLE_TABLELOCKING=OFF -DUSE_OPENMP=ON -DUSE_FFTW3=TRUE -DUSE_HDF5=ON -DCXX11=YES -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-fsigned-char -O2 -DNDEBUG -march=native" ../src/ && \
+    cd ${INSTALLDIR}/casacore/build && cmake -DCMAKE_INSTALL_PREFIX=${INSTALLDIR}/casacore/ -DDATA_DIR=${INSTALLDIR}/casacore/data -DBUILD_PYTHON3=ON -DBUILD_PYTHON=OFF -DENABLE_TABLELOCKING=OFF -DUSE_OPENMP=ON -DUSE_FFTW3=TRUE -DUSE_HDF5=ON -DCXX11=YES -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-fsigned-char -O2 -DNDEBUG -march=native" ../src/ && \
     cd ${INSTALLDIR}/casacore/build && make -j ${J} && \
     cd ${INSTALLDIR}/casacore/build && make install && \
     bash -c "strip ${INSTALLDIR}/casacore/{lib,bin}/* || true" && \