[envtest]Use keystone helpers from keystone-operator

[gibizer]

This was necessary to remove a dependency cycle from lib-common

Depends-On: #334 (merged)

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[gibizer]

/unhold

[openshift-ci]

@gibizer: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ironic-operator-build-deploy-tempest	5184ccc	link	false	/test ironic-operator-build-deploy-tempest

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[gibizer]

The tempest job will fail until the Route for ironic-api is created in the openstack-operator. openstack-k8s-operators/openstack-operator#488

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gibizer, hjensas

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