fix(vhosts): reset `cleanup` to previous and use dedicated `clean` SLS

[myii]

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
• [x] [fix] A bug fix
• [ ] [perf] A code change that improves performance
• [ ] [refactor] A code change that neither fixes a bug nor adds a feature
• [x] [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?

No.

Related issues and/or pull requests

Fixes #373.

Describe the changes you're proposing

https://saltstackcommunity.slack.com/archives/C7LG8SV54/p1634649838072400

• As pointed out by @Yoda-BZH in Slack, the previous implementation of the vhosts.cleanup SLS allowed removing unwanted vhosts but keeping the service running.
• In the discussions that followed, it appeared that the best resolution would be to reset this to its original form and then provide a separate vhosts.clean SLS (removing the symlink that was being used).
• Essentially, there are two use cases that need to be covered, so the symlink wasn't the right approach:
  • Removing unwanted vhosts but leaving the service running (i.e. cleanup).
  • Clearing the vhosts as part of cleaning (uninstalling) the whole Apache installation (i.e. clean).

Pillar / config required to test the proposed changes

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

[Yoda-BZH]

lgtm

[myii]

Thanks for the issue report and review, @Yoda-BZH!

[saltstack-formulas-travis]

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