shell, NM model: Consistently use 'settings.foo_bar' instead of 'settings["foo-bar"]'
shell, NM model: Consistently use 'settings.foo_bar' instead of 'settings["foo-bar"]'

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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