OSASINFRA-3312: Implements OpenStack Node pools

[EmilienM]

What this PR does / why we need it:

This PR adds OpenStack node pools support. It create a basic node pool with a flavor and image name (for now). CLI options are updated.

[openshift-ci-robot]

@EmilienM: This pull request references OSASINFRA-3312 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.17.0" version, but no target version was set.

In response to [this](https://github.com/openshift/hypershift/pull/4409): >**What this PR does / why we need it**: > >This PR adds OpenStack node pools support. >It create a basic node pool with a flavor and image name (for now). >CLI options are updated. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fhypershift). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

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[EmilienM]

/cc MaysaMacedo bryan-cox

[MaysaMacedo]

/lgtm

[MaysaMacedo]

/test e2e-openstack

[EmilienM]

Note about e2e-openstack, it's going to fail for sure as the job is still not fully working yet but we're actively working on it.

[EmilienM]

/test e2e-aks e2e-azure e2e-ibmcloud-iks e2e-ibmcloud-roks

[openshift-ci[bot]]

@EmilienM: The following tests 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/e2e-ibmcloud-iks	21759c4244d463662bce675046b9d72488ca3f21	link	false	/test e2e-ibmcloud-iks
ci/prow/e2e-openstack	21759c4244d463662bce675046b9d72488ca3f21	link	false	/test e2e-openstack
ci/prow/e2e-ibmcloud-roks	21759c4244d463662bce675046b9d72488ca3f21	link	false	/test e2e-ibmcloud-roks

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[EmilienM]

The openstack job failed because the job isn't ready yet and the IBM cloud jobs fail for a reason not related to this PR.

[bryan-cox]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bryan-cox, EmilienM

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/hypershift/blob/main/OWNERS)~~ [bryan-cox] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: hypershift This PR has been included in build ose-hypershift-container-v4.17.0-202407241715.p0.gb1aa633.assembly.stream.el9. All builds following this will include this PR.