adds migrations for metadata only

db/migrate/20180320193754_add_metadata_only_to_user_migration_export.rb

@@ -4,9 +4,9 @@ include Carto::Db::MigrationHelper
 
 migration(
   Proc.new do
-    add_column :user_migration_exports, :metadata_only, :boolean, default: false, null: false
+    add_column :user_migration_exports, :export_data, :boolean, default: true, null: false
   end,
   Proc.new do
-    drop_column :user_migration_exports, :metadata_only
+    drop_column :user_migration_exports, :export_data
   end
 )

db/migrate/20180320193754_add_metadata_only_to_user_migration_import.rb

@@ -4,9 +4,9 @@ include Carto::Db::MigrationHelper
 
 migration(
   Proc.new do
-    add_column :user_migration_imports, :metadata_only, :boolean, default: false, null: false
+    add_column :user_migration_imports, :import_data, :boolean, default: true, null: false
   end,
   Proc.new do
-    drop_column :user_migration_imports, :metadata_only
+    drop_column :user_migration_imports, :import_data
   end
 )