Adopt with grafana_network not grafana_server_addr (backport #7654)

[mergify]

The networks list in a spec is usually a range not a single IP. grafana_server_addr is a fact created from grafana_network so it is a more appropriate parameter to pass.

Follow up to 770a527

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This is an automatic backport of pull request #7654 done by Mergify.

[mergify]

Cherry-pick of b1f7e2d has failed:

On branch mergify/bp/stable-8.0/pr-7654
Your branch is up to date with 'origin/stable-8.0'.

You are currently cherry-picking commit b1f7e2da.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   infrastructure-playbooks/cephadm-adopt.yml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[fultonj]

Why was this PR closed?

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in two weeks if no further activity occurs. Thank you for your contributions.