VOL-2131:  Use base docker image

Change-Id: Icdb7243774d89443eeda438886d1c7da7ba58509
diff --git a/python/docker/Dockerfile.openonu_adapter b/python/docker/Dockerfile.openonu_adapter
index c0eea41..9c42a59 100644
--- a/python/docker/Dockerfile.openonu_adapter
+++ b/python/docker/Dockerfile.openonu_adapter
@@ -11,15 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-FROM ubuntu:16.04
-
-# Update to have latest images
-RUN apt-get update && \
-    apt-get install -y python openssl iproute2 libpcap-dev wget build-essential git binutils python-dev libffi-dev libssl-dev
-
-# Install current version of pip rather than outdated pip from apt
-RUN wget -O /tmp/get-pip.py https://bootstrap.pypa.io/get-pip.py
-RUN python /tmp/get-pip.py
+FROM voltha/voltha-python-base:1.0.0
 
 # Install adapter requirements.
 COPY requirements.txt /tmp/requirements.txt