Use 'inventory_hostnames' query for remove-node

[VannTen]

Using the 'inventory_hostnames' lookup instead of manual splitting
allows us to use ansible patterns ; we are no longer forced to
explicitely spell out hostnames (but doing so still works).

What type of PR is this?

/kind feature

What this PR does / why we need it:

It allows more flexibility for the remove-node.yml playbook. We can use
kube_master[1] instead of explicitely specifying my_kube_master_01 for
example.

Special notes for your reviewer:

This is a draft because the inventory_hostnames lookup don't really work properly
until this commit
in ansible, which is in ansible 2.11.0. So this is dependant on switching to
ansible 2.11

Does this PR introduce a user-facing change?:

Ansible patterns can now be used in the `node` variables for the `remove-node.yml`
playbook.

[k8s-ci-robot]

Hi @VannTen. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: VannTen
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[VannTen]

Superseded by #8334
/close

[k8s-ci-robot]

@VannTen: Closed this PR.

In response to this:

Superseded by #8334
/close

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