How to use the yay.load_uri function in yay

self.root = root
        self.expression = expression

        self.host = host
        self.user = user
        self.port = None

        self.ypath = root.ypath
        self.resume = root.resume
        self.no_resume = root.no_resume
        self.simulate = root.simulate
        self.verbose = root.verbose

        self.options = {}
        if os.path.exists("/etc/yaybu"):
            self.options = yay.load_uri("/etc/yaybu")

        self.transport = Transport(context=self,
            verbose = root.verbose,
            simulate = root.simulate,
            env_passthrough = root.env_passthrough)

        self.changelog = changes.ChangeLog(self)
        self.changelog.configure_session_logging()

self.user = self.params.server.user.as_string(
            default=getpass.getuser())
        self.port = self.params.server.port.as_int(default=22)
        self.password = self.params.server.password.as_string(default="")
        self.private_key = self.params.server.private_key.as_string(default="")

        root = self.root
        self.ypath = root.ypath
        self.resume = root.resume
        self.no_resume = root.no_resume
        self.simulate = root.simulate
        self.verbose = root.verbose

        self.options = {}
        if os.path.exists("/etc/yaybu"):
            self.options = yay.load_uri("/etc/yaybu")

        if "://" in hostname:
            parsed = urlparse.urlparse(hostname)
            Transport = self.transports[parsed.scheme]
        else:
            Transport = self.transports["ssh"]

        self.transport = Transport(
            context=self,
            verbose=root.verbose,
            simulate=root.simulate,
        )

        with root.ui.throbber("Connect to '%s'" % hostname):
            self.transport.connect()

self.user = self.params.server.user.as_string(default=getpass.getuser())
        self.port = self.params.server.port.as_string(default=22)
        self.password = self.params.server.password.as_string(default="")
        self.private_key = self.params.server.private_key.as_string(default="")

        root = self.root
        self.ypath = root.ypath
        self.resume = root.resume
        self.no_resume = root.no_resume
        self.simulate = root.simulate
        self.verbose = root.verbose
        self.changelog = root.changelog

        self.options = {}
        if os.path.exists("/etc/yaybu"):
            self.options = yay.load_uri("/etc/yaybu")

        self.transport = self.Transport(
            context=self,
            verbose = root.verbose,
            simulate = root.simulate,
            )

        with root.ui.throbber("Connecting to '%s'" % hostname) as throbber:
            self.transport.connect()

        if not self.simulate and not self.transport.exists(self.get_data_path()):
            self.transport.makedirs(self.get_data_path())

        # This makes me a little sad inside, but the whole
        # context thing needs a little thought before jumping in
        self.state = event.EventState()