Description of problem:

Upper case of MAC address doesn't work in instackenv.json.

Deployment, with the fencing.yaml environment file included, fails with:

~~~
GET call to orchestration for http://10.243.0.5:8004/v1/726da6a9f9454c838be355b4ffa823dc/software_deployments/c32ff7e7-9a2d-4d6d-bd98-36eb7f3e05d1 used request id req-979f1e94-d594-4d58-816b-c8d7fa6fb4d2
overcloud.AllNodesDeploySteps.ComputeOvsDpdkDeployment_Step5.13:
  resource_type: OS::Heat::StructuredDeployment
  physical_resource_id: e9077613-e896-4764-b733-818ac9716c9d
  status: UPDATE_FAILED
  status_reason: |
    Error: resources[13]: Deployment to server failed: deploy_status_code : Deployment exited with non-zero status code: 2
  deploy_stdout: |
    ...
            "Warning: tag is a metaparam; this value will inherit to all contained resources in the tripleo::firewall::rule definition",
            "Warning: Unknown variable: '::deployment_type'. at /etc/puppet/modules/tripleo/manifests/fencing.pp:70:30",
            "Error: Evaluation Error: Error while evaluating a Function Call, Multiple (or zero) IPmilan devices for a single host are not supported with instance HA at /etc/puppet/modules/tripleo/manifests/fencing.pp:79:7 on node vsbgdellpod-overcloud-computeovsdpdk-13.localdomain"
~~~

Actual results:

It is not possible to use Uppercase letters in MAC address in instackenv.json file

Expected results:

It is possible to use Uppercase letters in MAC address in instackenv.json file

Additional info:

Both formats should be accepted.