Rework dockerfile demo with git tag branch

demo/Dockerfile

@@ -2,15 +2,13 @@ FROM local/dockervino:phase2 as phase2
 FROM local/dockervino:phase1 as phase1
 ARG INSTALL_DIR=/opt/intel/openvino
 WORKDIR $INSTALL_DIR/deployment_tools
-RUN apt install -y libmosquittopp-dev
-RUN rm -rf open_model_zoo
-# clone forked branch
-RUN git clone https://github.com/Ukhupacha/open_model_zoo.git --branch kontron --depth 1 
-# build Inference Engine Samples
-RUN $INSTALL_DIR/deployment_tools/inference_engine/samples/build_samples.sh
-# build demo samples
-RUN $INSTALL_DIR/deployment_tools/inference_engine/demos/build_demos.sh
-RUN apt autoremove -y && rm -rf /var/lib/apt/lists/*
+RUN apt install -y libmosquittopp-dev && \
+	rm -rf open_model_zoo && \
+	git clone https://github.com/Ukhupacha/open_model_zoo.git --branch MQTT1 --depth 1 && \
+	$INSTALL_DIR/deployment_tools/inference_engine/samples/build_samples.sh && \
+	$INSTALL_DIR/deployment_tools/inference_engine/demos/build_demos.sh && \
+	rm -rf $INSTALL_DIR/deployment_tools/open_model_zoo && \
+	apt autoremove -y && rm -rf /var/lib/apt/lists/*
 FROM scratch
 COPY --from=phase1 / /
 COPY --from=phase2 /root/openvino_models/ir /root/openvino_models/ir