Bad Migration Date checker checks non-ruby files when it shouldn't

[Fryguy]

Example from one of my PRs:

Some comments on commit https://github.com/Fryguy/manageiq/commit/d6ec1eeff40b6703205560431ee3144967836462

• :red_circle: Bad migration date: db/migrate/data/20160127210624_convert_configurations_to_settings_changes/broker_notify_properties.tmpl.yml

[Fryguy]

This is because it does File.basename, which in this case gives broker_notify_properties.tmpl.yml, which of course has a bad migration date. Probable fix is to only look at files directly in db/migrate and not subdirs.

[miq-bot]

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