NO-JIRA: fix: populate AGENT_MASTER_HOSTNAMES in configure_node

[fracappa]

This is a small fix following #1885 patch

[openshift-ci]

Hi @fracappa. Thanks for your PR.

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[elfosardo]

/ok-to-test

[dtantsur]

/lgtm

[elfosardo]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elfosardo

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