db_api: cursor class doesn't have _connection attribute

Actual and correct method call:

Lines 265 to 266 in 1f80a39

    
           except Aborted: 
        
               self.connection.retry_transaction()

While in few methods object tried to call a wrong attribute which doesn't exist:

Lines 282 to 283 in 1f80a39

    
           self._connection.retry_transaction() 
        
           return self.fetchall()

Lines 313 to 314 in 1f80a39

    
           self._connection.retry_transaction() 
        
           return self.fetchmany(size)

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	self._connection.retry_transaction()
	return self.fetchmany(size)