We force the hostname in `kitchen` so the `_mapdata` files can be
static.

The use of `eq` instead of `include` premits to have a nice diff after
the `expected/got` oneliners.

We store validated `map.jinja` dump under the profile `files`
directory to access them with `inspec.profile.file('filename')` to
validate the content of the generated mapdata file.

The YAML files contain a value specific to each minion, its hostname,
so we use string format to expand `%{hostname}`.

The `default` inspec profile need to depends on `share` to access the
`system` and `salt_minion` libraries.