Adding oc client to dockerfile for running post-install provisioning

[etsauer]

What does this PR do?

See above

How should this be manually tested?

Start docker container with run script, and try running an oc command

./docker/openstack-client-centos/run.sh --repository=/home/esauer/src/
oc login

Is there a relevant Issue open for this?

n/a

Who would you like to review this?

/cc @sabre1041 @oybed

[sabre1041]

built and validated oc tool installed

@oybed do you want to review?

[oybed]

LGTM - merging