'Deletes a new Security Group using the group name.
:param      group_name: The name of the security group
:type       group_name: ``str``
:rtype: ``bool``'

def ex_delete_security_group_by_name(self, group_name):

    params = {'Action': 'DeleteSecurityGroup', 'GroupName': group_name}
    res = self.connection.request(self.path, params=params).object
    return self._get_boolean(res)
