METAL-871: baremetal: bootstrap: rename master label

[honza]

Let's use the new k8s upstream name.

This is a follow-up to #7649

[dtantsur]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[zaneb]

Unit test failure is a flake.
/lgtm
/retest-required

[openshift-ci-robot]

@honza: This pull request references METAL-871 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 story to target the "4.16.0" version, but no target version was set.

In response to this:

Let's use the new k8s upstream name.

This is a follow-up to #7649

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 1b99648 and 2 for PR HEAD deb484f in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD e245acb and 1 for PR HEAD deb484f in total

[openshift-ci]

@honza: 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-metal-ipi-sdn-swapped-hosts	deb484f	link	false	/test e2e-metal-ipi-sdn-swapped-hosts

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 0e2c277 and 0 for PR HEAD deb484f in total