Merge "Add python-memcache package openstack base"

docker/openstack-base/Dockerfile.j2

@@ -167,6 +167,7 @@ RUN apt-get install -y --no-install-recommends \
         python-ironicclient \
         python-magnumclient \
         python-manilaclient \
+        python-memcache \
         python-mistralclient \
         python-muranoclient \
         python-pip \