Adds designateclient

Author: Burke9077

Dockerfile

@@ -1,6 +1,7 @@
 FROM python:3.7-buster
 
 RUN apt-get update && apt-get -yq install \
+    python3-designateclient \
     python3-octaviaclient \
     python3-openstackclient \
   && rm -rf /var/lib/apt/lists/*