Move default config params to individual config files in their plugins

Summary:
- Move default config params to individual config files in their plugins
- Move data provider testing configs to individual files
- Update DataProvider_Core to use different config groups, not subgroups
- Remove a bit of dupe config in frontlinesms/init.php
- Fix docblock in Email data provider

Test Plan: Run ` ./bin/behat -c application/tests/behat.yml application/tests/features/data-provider/`

Reviewers: shadowhand, eyedol

Reviewed By: eyedol

Maniphest Tasks: T130

Differential Revision: https://phabricator.ushahidi.com/D136