Delete an SNS topic.

    CLI example::

        salt myminion boto3_sns.delete_topic mytopic region=us-east-1

def delete_topic(TopicArn, region=None, key=None, keyid=None, profile=None):
    '''
    Delete an SNS topic.

    CLI example::

        salt myminion boto3_sns.delete_topic mytopic region=us-east-1
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
    try:
        conn.delete_topic(TopicArn=TopicArn)
        log.info('SNS topic %s deleted', TopicArn)
        return True
    except botocore.exceptions.ClientError as e:
        log.error('Failed to delete SNS topic %s: %s', name, e)
        return False