Add libvirt ipv6 support scenario in vagrant (backport #7434)

[mergify]

This is an automatic backport of pull request #7434 done by Mergify.
Cherry-pick of 8f3bdd8 has failed:

On branch mergify/bp/stable-7.0/pr-7434
Your branch is up to date with 'origin/stable-7.0'.

You are currently cherry-picking commit 8f3bdd855.
  (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)

Changes to be committed:
	modified:   Vagrantfile
	modified:   roles/ceph-facts/tasks/grafana.yml
	new file:   tests/functional/all_daemons_ipv6/Vagrantfile
	new file:   tests/functional/all_daemons_ipv6/ceph-override.json
	new file:   tests/functional/all_daemons_ipv6/container/Vagrantfile
	new file:   tests/functional/all_daemons_ipv6/container/ceph-override.json
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/all
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/clients
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/iscsigws
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/mons
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/osds
	new file:   tests/functional/all_daemons_ipv6/container/group_vars/rgws
	new file:   tests/functional/all_daemons_ipv6/container/hosts
	new file:   tests/functional/all_daemons_ipv6/container/vagrant_variables.yml
	new file:   tests/functional/all_daemons_ipv6/group_vars/all
	new file:   tests/functional/all_daemons_ipv6/group_vars/clients
	new file:   tests/functional/all_daemons_ipv6/group_vars/iscsigws
	new file:   tests/functional/all_daemons_ipv6/group_vars/mons
	new file:   tests/functional/all_daemons_ipv6/group_vars/nfss
	new file:   tests/functional/all_daemons_ipv6/group_vars/osds
	new file:   tests/functional/all_daemons_ipv6/group_vars/rgws
	new file:   tests/functional/all_daemons_ipv6/hosts
	new file:   tests/functional/all_daemons_ipv6/vagrant_variables.yml
	modified:   tests/requirements.txt

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   tox.ini

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

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