Use domains' setname as --cert-name option

[kiniou]

PR progress checklist (to be filled in by reviewers)

• Changes to documentation are appropriate (or tick if not required)
• Changes to tests are appropriate (or tick if not required)
• Reviews completed

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What type of PR is this?

Primary type

• [build] Changes related to the build system
• [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [ci] Changes to the continuous integration configuration
• [feat] A new feature
• [fix] A bug fix
• [perf] A code change that improves performance
• [refactor] A code change that neither fixes a bug nor adds a feature
• [revert] A change used to revert a previous commit
• [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [docs] Documentation changes
• [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

Yes.
The setname was not used before and the certificate path will not be the same.
The most obvious change that needs to be done is changing the pillar to match the first domain in a domain sets like the following:

letsencrypt:
  domains:
    foo.example.com:
      - foo.example.com

Related issues and/or pull requests

Describe the changes you're proposing

Certbot has the ability to name a certificate with the --cert-name option.

This allows us for instance to refers to this same setname to other
configuration and then further automate virtualhost creation in nginx or apache.

Pillar / config required to test the proposed changes

Here is an example that should write the certificates into /etc/letsencrypt/live/foo/ path:

letsencrypt:
  domains:
    foo:
      - foo.example.com

You might need to change the .example.com with something real if tested against a real ACME server (I've tested this change locally with a local pebble server).

Debug log showing how the proposed changes work

Documentation checklist

• Updated the README (e.g. Available states).
• Updated pillar.example.

Testing checklist

• Included in Kitchen (i.e. under state_top).
• Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• Updated the relevant test pillar.

Additional context

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     Use domains' setname as --cert-name option

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[myii]

Replaced by #76.