Issue #2609552 by mikeryan: Remove migrate_tools from migrate_plus

migrate_example/README.txt

migrate_tools/migrate_tools.drush.inc

migrate_tools/migrate_tools.info.yml

migrate_tools/migrate_tools.links.action.yml

migrate_tools/migrate_tools.links.menu.yml

migrate_tools/migrate_tools.module

migrate_tools/migrate_tools.permissions.yml

migrate_tools/migrate_tools.routing.yml

migrate_tools/src/Controller/MessageController.php

migrate_tools/src/Controller/MigrationGroupListBuilder.php

migrate_tools/src/Controller/MigrationListBuilder.php

migrate_tools/src/DrushLogMigrateMessage.php

migrate_tools/src/Form/MigrationAddForm.php

migrate_tools/src/Form/MigrationDeleteForm.php

migrate_tools/src/Form/MigrationEditForm.php

migrate_tools/src/Form/MigrationFormBase.php

migrate_tools/src/Form/MigrationGroupAddForm.php

migrate_tools/src/Form/MigrationGroupDeleteForm.php

migrate_tools/src/Form/MigrationGroupEditForm.php

migrate_tools/src/Form/MigrationGroupFormBase.php