Fix openstack build goss failing network-dispatcher

[nilpntr]

Change description

I've added the missing part that installs networkd-dispatcher and starts it:

- name: Install networkd-dispatcher service (Run networkd-dispatcher)
  ansible.builtin.systemd:
    name: networkd-dispatcher
    state: started
    enabled: true

Related issues

• Fixes Openstack goss failing networkd-dispatcher #1626

Additional context

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[linux-foundation-easycla]

• ✅login: nilpntr / (84a9271)

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[k8s-ci-robot]

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[mboersma]

/ok-to-test