Fixes Bug 1275 and Bug 1273 - aiokafka>0.7.0 needs extra dependency for python < 3.7.0

Change-Id: I5226e1d790c37d889fac2e6d8285f41f033e9529
Signed-off-by: fonsecaj <jpedrofonseca@av.it.pt>

docker/NBI/Dockerfile

@@ -25,7 +25,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y install curl sof
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y git python3 python3-jsonschema \
     python3-pymongo python3-yaml python3-pip python3-keystoneclient \
     && pip3 install -U pip \
-    && python3 -m pip install aiokafka aiohttp cherrypy==18.1.2 pyangbind keystoneauth1 \
+    && python3 -m pip install aiokafka dataclasses aiohttp cherrypy==18.1.2 pyangbind keystoneauth1 \
     && mkdir -p /app/storage/kafka && mkdir -p /app/log
 
 ARG REPOSITORY_BASE=http://osm-download.etsi.org/repository/osm/debian