Allow setting 'auto-assign' property to 'false' for default IP pool (Metallb addon)

[ikrozhkov]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This allow to create metallb config where only one IP pool with property auto-assign: false. This is useful if you have pool of IPs which is you don't want to assign to every kubernetes services with type: LoadBalancer but assign to only allowed services.
Example:

address-pools:
- name: ingress
  protocol: layer2
  addresses:
  - 140.82.121.4/32
  auto-assign: false

+ added commented line to inventory\sample\group_vars\k8s_cluster\addons.yml - related with approved PR #8111

# metallb_pool_name: "loadbalanced"

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[Metallb] Allow setting 'auto-assign' property to 'false' for default IP pool (var `matallb_auto_assign`)

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ IKRozhkov (56b5673, 4a77e6a)

[k8s-ci-robot]

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[k8s-ci-robot]

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[oomichi]

Thanks for your contribution, just one comment.

/cc @oomichi

[oomichi]

Could you specify the default value true here?
The sample inventory contains the default values as possible.

[ikrozhkov]

@oomichi thanks for the adjustment! Fixed.

[oomichi]

Thanks for updating quickly.

/lgtm

[oomichi]

/ok-to-test

[floryut]

@ikrozhkov Thanks for the PR 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, IKRozhkov

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