Deletes the specified virtual MFA device.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_iam.delete_virtual_mfa_device serial_num

def delete_virtual_mfa_device(serial, region=None, key=None, keyid=None, profile=None):
    '''
    Deletes the specified virtual MFA device.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_iam.delete_virtual_mfa_device serial_num
    '''
    conn = __utils__['boto3.get_connection_func']('iam')()
    try:
        conn.delete_virtual_mfa_device(SerialNumber=serial)
        log.info('Deleted virtual MFA device %s.', serial)
        return True
    except botocore.exceptions.ClientError as e:
        log.debug(e)
        if 'NoSuchEntity' in six.text_type(e):
            log.info('Virtual MFA device %s not found.', serial)
            return True
        log.error('Failed to delete virtual MFA device %s.', serial)
        return False