Feat/148 ubi refactor policy component

Closes #148 (closed)

src/nbi/Dockerfile

@@ -61,6 +61,9 @@ RUN apt-get --yes --quiet --quiet update && \
     rm -rf /var/lib/apt/lists/*
 RUN mkdir -p /var/libyang
 RUN git clone https://github.com/CESNET/libyang.git /var/libyang
+WORKDIR /var/libyang
+RUN git fetch
+RUN git checkout v2.1.148
 RUN mkdir -p /var/libyang/build
 WORKDIR /var/libyang/build
 RUN cmake -D CMAKE_BUILD_TYPE:String="Release" ..