Updated Dockerfile to include python-shade

[oybed]

What does this PR do?

Introduce python-shade to support the latest OpenStack modules in ansible.

How should this be manually tested?

Build/Spin up a new image of the openstack-client-centos instance. Verify that it is successful. Then just run help('modules') in python shell to verify that shade is part of the list... or run the CASL provisioning to test that there's no breakage.

Is there a relevant Issue open for this?

N/A

Who would you like to review this?

/cc @sabre1041 @etsauer

[sabre1041]

@oybed confirmed shade module is present after building new container