[TECH DEBT] The pillar configuration is confusing

[lkubb]

Description of the tech debt to be addressed, include links and screenshots

For unclear reasons, the pillar module is currently confusingly configured like this:

- ext_pillar:
  - vault: path=foo/bar
  # or
  - vault:
      conf: path=foo/bar

It does not support multiple paths or any other configuration passed in the string.

It should be simplified to:

- ext_pillar:
  - vault: foo/bar
  # or
  - vault:
      path: foo/bar

Since we have the attention of people migrating explicitly anyways, let's do it in the initial release.

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