Add RHV as a provider

[jeffcpullen]

What does this PR do?

This PR allows for the provisioning of VMs onto RHV and oVirt environments

How should this be manually tested?

Until the new casl-ansible docker image is available from quay.io (#344 ) you'll need to run this using the docker image provided in the previous PR.

docker run -u `id -u` \
 -v $HOME/.ssh/id_rsa:/opt/app-root/src/.ssh/id_rsa:Z  \
 -v <REPLACE WITH PATH TO PARENT CASL GIT DIRECTORY>:/tmp/src:Z \
 -e INVENTORY_DIR=<REPLACE WITH PATH TO PARENT CASL GIT DIRECTORY>/casl-ansible/inventory/sample.rhv.example.com.d/inventory \
 -e PLAYBOOK_FILE=<REPLACE WITH PATH TO PARENT CASL GIT DIRECTORY>/casl-ansible/playbooks/openshift/rhv/provision.yml \
 -e OVIRT_URL='https://rhvm.example.com/ovirt-engine/api/v4' \
 -e OVIRT_USERNAME='admin@internal' \
 -e OVIRT_PASSWORD='rhvm_password' \
 -e OVIRT_CA='<REPLACE WITH PATH TO PARENT CASL GIT DIRECTORY>/casl-ansible/ca.crt' \
 -e ANSIBLE_USER='cloud-user' \
 -e ANSIBLE_PASS='template_password' \
 -i redhat-cop/casl-ansible

Is there a relevant Issue open for this?

resolves #345

Other Relevant info, PRs, etc.

Blocked by #344

Who would you like to review this?

cc: @redhat-cop/casl

[garethahealy]

looks like this needs a review, CC @redhat-cop/casl