Fix ActiveRecord mysql tests

TL;DR: MySQL sucks.

Since it does not support transactions for schema changes,
when you run `create_table` in setup block, it will commit
current transaction. Now tests want to run `RELEASE SAVEPOINT`
after finishing tests which fails since there is no transaction.

activerecord/test/cases/migration/logger_test.rb

@@ -9,7 +9,7 @@ def migrate direction
         end
       end
 
-      def setup
+      def initialize(*args)
         super
         ActiveRecord::SchemaMigration.create_table
         ActiveRecord::SchemaMigration.delete_all
@@ -31,3 +31,4 @@ def test_migration_should_be_run_without_logger
     end
   end
 end
+