Add missing packages to agent container
Add missing packages to agent container

Add python-memcached and MySQL-python to agent container so that it can
deploy in isolation.

Closes-Bug: #1651508
Co-Authored-By: Martin André <c80c1833255fea0e99668c2e346220e67c8ddcfa@redhat.com>
Change-Id: I4ffdf75ddbceccf2c9367b9eb342aefdeb35750b

openstack/tripleo-common,openstack/tripleo-common