Change to hostname rather than IP for validations check node

[bshephar]

This change switches the default value for cifmw_validations_edpm_check_node to use a hostname rather than an IP address. This will ensure we match against the Ansible inventory host and not depend on the IP address of that node always being the same.

As a pull request owner and reviewers, I checked that:

• Appropriate testing is done and actually running
• Appropriate documentation exists and/or is up-to-date:
  • README in the role
  • Content of the docs/source is reflecting the changes

[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://review.rdoproject.org/zuul/buildset/12fdb70cf2a944d3828b67d880dbce2b

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 40m 01s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 24m 16s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 19m 18s
✔️ noop SUCCESS in 0s
❌ cifmw-pod-ansible-test FAILURE in 5m 25s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 13s
✔️ cifmw-molecule-validations SUCCESS in 5m 00s

[lewisdenny]

recheck

ERROR! Failed to clone a Git repository from [https://github.com/ansible-collections/community.general.](https://github.com/ansible-collections/community.general%60.)

[lewisdenny]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[pablintino]

/lgtm