README revision

[jpodivin]

Adjust REAME to explicitly state that we have NETWORK_ISOLATION set to true by default, and that it's better to use openstack_deploy_wait target.

This should save newcomers some head scratches.

[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://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/823c6e275da44b82b3dfe00a9b229422

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 21m 43s
❌ install-yamls-crc-podified-edpm-baremetal RETRY_LIMIT in 1m 29s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 17m 39s

[karelyatin]

/lgtm

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-merge-robot]

PR needs rebase.

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