Fixed class name, because class name was a duplicated name

Author: IAGO HENRIQUE

dbaas/drivers/replication_topologies/base.py

@@ -724,7 +724,7 @@ def get_stop_database_vm_steps(self):
                 'workflow.steps.util.database.checkAndFixMySQLReplication',
             )}, {
             'Stopping database': (
-                'workflow.steps.util.mysql.SaveMysqlBinlog',
+                'workflow.steps.util.mysql.SaveMysqlBinlogToStopDatabase',
                 'workflow.steps.util.database.Stop',
                 'workflow.steps.util.database.StopRsyslog',
                 'workflow.steps.util.database.CheckIsDown',

dbaas/workflow/steps/util/mysql.py

@@ -229,7 +229,7 @@ def do(self):
         client = driver.get_client(self.instance)
 
 
-class SaveMySqlBinlog(MySQLStep):
+class SaveMysqlBinlogToStopDatabase(MySQLStep):
 
     def __unicode__(self):
         return "Saving binlog position to stop database..."