ci: update to `3000.2`, remove `2018.3` & update tests for Zabbix `4.4.8`

[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
• [x] [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
• [x] [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

• CI changes automated using https://github.com/myii/ssf-formula/pull/169

Describe the changes you're proposing

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

[pull-assistant[bot]]

Best reviewed: commit by commit

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Optimal code review plan

     ci(kitchen+travis): adjust matrix to add `3000.2` & remove `2018.3`      test(packages_spec): update for `4.4.8`

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[commit-lint[bot]]

Contributors

@myii

[myii]

Self-merge, CI and tests only.

[saltstack-formulas-travis]

:tada: This PR is included in version 1.0.1 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: