fix(debian): avoid adding repositories entries multiple times

[javierbertoli]

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
• [ ] [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

As described in

• https://github.com/saltstack/salt/issues/60220 and
• https://github.com/saltstack/salt/issues/59785#issuecomment-826590482

repositories entries in the Debian's family are being re-added each time the formula is run.

Describe the changes you're proposing

As proposed here, moved away from pkgrepo and manage the repository's file with file.managed.

Used the same parameters to keep it backward compatible.

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).
• [X] Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• [ ] Updated the relevant test pillar.

Additional context

[myii]

Appreciate the fix, @javierbertoli -- merged.

[saltstack-formulas-travis]

:tada: This PR is included in version 2.8.1 :tada:

The release is available on GitHub release

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