Fix broken dependencies

This is a quick fix to checkout the latest tag of N2VC (BUILD_v4.0.1_1).
Recent commits reveal that some Dockerfiles are using master, instead of
the most recent release, which has caused the install to fail due to
changes in master.

Change-Id: I31280a976d9be2acccca1c75e5b86afeac58e8ee
Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/Dockerfile.local b/Dockerfile.local
index 5ff0fec..b93319b 100644
--- a/Dockerfile.local
+++ b/Dockerfile.local
@@ -16,6 +16,7 @@
 
 RUN git clone https://osm.etsi.org/gerrit/osm/N2VC.git \
     && cd N2VC \
+    && git checkout BUILD_v4.0.1_1 \
     && pip3 install websockets==4.0.1 \
     && pip3 install requests \
     && cd modules/libjuju && python3 setup.py develop && cd ../.. \