Steps:
1. A migration that removes admin_support_email and tech_support_email from Service. It's done with rails generate migration NameOfMigration, and for the interior you can see this example: https://github.com/3scale/porta/blob/master/db/migrate/20180206151716_remove_unused_fields_from_settings.rb
2. We need to run the migration in the 3 DBs locally, to see if they work and then automatically edit their schemas before pushing. Once pushed, run the tests in CircleCI.
3. Change https://github.com/3scale/porta/pull/443/files#diff-429ba4b898db6256e83d736e6e387649R18 for what we had there before since it won't be needed anymore.
4. Probably also change https://github.com/3scale/porta/pull/443/files#diff-429ba4b898db6256e83d736e6e387649R46 for what we had there before.
5. Create an issue in https://github.com/3scale/infrastructure for Ops to run the migration manually on SaaS before we merge this PR. An example of this: https://github.com/3scale/infrastructure/issues/598