nit: Correct the used SSH key in ansible inventory

[cjeanner]

We were missing the right ssh key configuration in the generated ansible
inventory, leading to "some" issues.

We also ensure ansible won't complain about the remote host keys. A
better solution might come later, once we're over the deep network
refactoring

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

• Appropriate testing is done and actually running

[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/80e42e8d53544f469e2e27438408559d

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 51m 12s
❌ podified-multinode-edpm-deployment-crc POST_FAILURE in 1h 32m 05s
❌ cifmw-crc-podified-edpm-baremetal MERGE_CONFLICT in 3s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 52s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 57s
✔️ cifmw-baremetal-nested-crc SUCCESS in 1h 05m 37s
✔️ cifmw-molecule-libvirt_manager SUCCESS in 12m 40s
✔️ cifmw-molecule-reproducer SUCCESS in 16m 31s

[raukadah]

/approve

[openshift-ci]

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