This moves all core functionality into the openshift-ansible repo, adds
the necessary equivalent entrypoint to the openshift-ansible installer
image, and ensures the dynamic inventory mechanisms in openshift-ansible
continue to work.

Notable changes from origin-gce:

* playbook extensions changed to .yml
* dynamic inventory subdirectory created to prevent accidental use
* use the custom entrypoint entrypoint-gcp for this image
* move tasks into openshift_gcp role

Also add libcloud (required for dynamic GCE lookup) and which (relied on
by gcloud).

There are modules in openshift-ansible that depend on boto3 (I see lib_utils/library/oo_iam_kms and lib_utils/library/oo_ec2_group). Add the dependency so that the origin-ansible container can succesfully run these modules.

The upstream forces versions on packages, and rpm -V fails when it does
not match. Also add which, used by gcloud.

The installer image will become our default cloud operations image for
tasks that overlap with ansible, and will also be the image for
provioning. We will eventually add others like awscli for support roles.

The oc client was left out with the move away from playbook2image.
However it is needed in the image for the `oc cluster up` use case for
installing logging or metrics.

This change adds oc via the latest signed and released client RPM,
which requires adding the centos-openshift-origin repo to the image.

We do not need the builder functionality from playbook2image and the
resulting image was overly complicated, so this simply builds on
Centos/RHEL.

Merged by openshift-bot