add python-kazoo and python-six when using centos source install type

Closes-Bug: #1525055
Change-Id: Id800da1a0cce4db20c32e8daf09c5f0f2c9f8929

docker/base/Dockerfile.j2

@@ -146,6 +146,8 @@ RUN yum install -y \
 # Update packages
 RUN yum -y install \
         curl \
+        python-kazoo \
+        python-six \
         sudo \
         tar \
         which \