Control Plane Machine Set manifest generator tweaks

[damdo]

Tweaks the cpms generation flow:

• silence make cpms-generator, so it can be piped to other commands
• use the KUBECONFIG env var if no --kubeconfig is passed

[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

[JoelSpeed]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoelSpeed

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 287342d and 2 for PR HEAD 27a7946 in total

[damdo]

/retest-required

[damdo]

/retest-required

[openshift-ci]

@damdo: 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/e2e-aws-disruptive	27a7946	link	false	/test e2e-aws-disruptive

Full PR test history. Your PR dashboard.

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