refactor(ng/init.sls): use `grains.get` to detect containers

[myii]

PR progress checklist (to be filled in by reviewers)

• [x] Changes to documentation are appropriate (or tick if not required)
• [x] Changes to tests are appropriate (or tick if not required)
• [x] 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
• [x] [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

Follow-up for #44.

Describe the changes you're proposing

Use grains.get directly rather than via. config.get. Also increase the list of containers that are checked for, based on discussions in the wg.

Pillar / config required to test the proposed changes

Covered by existing setup.

Debug log showing how the proposed changes work

As shown in Travis.

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

[saltstack-formulas-travis]

:tada: This PR is included in version 0.19.1 :tada:

The release is available on GitHub release

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