Determine if a name set a given zone file hash.
    Return {'result': True/False} if so
    Return {'error': ...} on error

def is_name_zonefile_hash(name, zonefile_hash, hostport=None, proxy=None):
    """
    Determine if a name set a given zone file hash.
    Return {'result': True/False} if so
    Return {'error': ...} on error
    """
    assert hostport or proxy, 'Need hostport or proxy'
    if proxy is None:
        proxy = connect_hostport(hostport)

    zonefile_check_schema = {
        'type': 'object',
        'properties': {
            'result': {
                'type': 'boolean'
            }
        },
        'required': [ 'result' ]
    }

    schema = json_response_schema(zonefile_check_schema)
    resp = {}
    try:
        resp = proxy.is_name_zonefile_hash(name, zonefile_hash)
        resp = json_validate(schema, resp)
        if json_is_error(resp):
            return resp

    except ValidationError as e:
        if BLOCKSTACK_DEBUG:
            log.exception(e)

        resp = {'error': 'Server response did not match expected schema.  You are likely communicating with an out-of-date Blockstack node.', 'http_status': 502}
        return resp

    except socket.timeout:
        log.error("Connection timed out")
        resp = {'error': 'Connection to remote host timed out.', 'http_status': 503}
        return resp

    except socket.error as se:
        log.error("Connection error {}".format(se.errno))
        resp = {'error': 'Connection to remote host failed.', 'http_status': 502}
        return resp

    except Exception as ee:
        if BLOCKSTACK_DEBUG:
            log.exception(ee)

        log.error("Caught exception while connecting to Blockstack node: {}".format(ee))
        resp = {'error': 'Failed to contact Blockstack node.  Try again with `--debug`.', 'http_status': 500}
        return resp

    return {'result': resp['result']}