Fix bug 1778 - Adding openstack client to Keystone dockerfile

Change-Id: Ia4d8fc323a8d9b8a64810b676d4cb206d5fcd01f
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>

docker/Keystone/Dockerfile

@@ -53,7 +53,8 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     rm -rf /var/lib/apt/lists/* && \
     chmod +x start.sh
 
-RUN pip3 install -U pip==21.3.1 && pip3 install python-ldap==3.2.0 ldappool==3.0.0
+RUN pip3 install -U pip==21.3.1 && \
+    pip3 install python-ldap==3.2.0 ldappool==3.0.0 python-openstackclient==5.7.0
 
 # database
 ENV DB_HOST                 keystone-db