closes #7614

This was added by accident in 4e18f384.

closes #7598

This was a leftover from rails_admin which was removed in #7440.

closes #7597

They were added a long time ago and they talk about rails 3 ... we have
rails 5 now and scripts in the bin folder, so I think we can remove
them.

closes #7596

closes #7595

closes #7594

This is an internal active record table and shouldn't be touched. When
this is truncated you need to fix it again by running
`bin/rails db:environment:set RAILS_ENV=test`

This is a temporary fix until there is a new version of
database_cleaner.

closes #7606

closes #7605

closes #7601

closes #7583