Create an SNS topic.

    CLI example::

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

def create_topic(Name, region=None, key=None, keyid=None, profile=None):
    '''
    Create an SNS topic.

    CLI example::

        salt myminion boto3_sns.create_topic mytopic region=us-east-1
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
    try:
        ret = conn.create_topic(Name=Name)
        log.info('SNS topic %s created with ARN %s', Name, ret['TopicArn'])
        return ret['TopicArn']
    except botocore.exceptions.ClientError as e:
        log.error('Failed to create SNS topic %s: %s', Name, e)
        return None
    except KeyError:
        log.error('Failed to create SNS topic %s', Name)
        return None