Merge pull request #8942 from yahonda/tested_only_with_mysql

Address test_create_when_database_exists_outputs_info_to_stderr failures

activerecord/test/cases/tasks/mysql_rake_test.rb

@@ -3,6 +3,10 @@
 module ActiveRecord
   class MysqlDBCreateTest < ActiveRecord::TestCase
     def setup
+      unless current_adapter?(:MysqlAdapter, :Mysql2Adapter)
+        return skip("only tested on mysql or mysql2")
+      end
+
       @connection    = stub(:create_database => true)
       @configuration = {
         'adapter'  => 'mysql',