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Get the oslo_config options common for all auth plugins.

    These may be useful without being registered for config file generation
    or to manipulate the options before registering them yourself.

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        :auth_type: The name of the plugin to load.
        :auth_section: The config file section to load options from.

    :returns: A list of oslo_config options.
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Get the oslo_config options for a specific plugin.

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    the specified plugin.

    :param plugin: The name of the plugin loader or a plugin loader object
    :type plugin: str or keystoneauth1._loading.BaseLoader

    :returns: A list of oslo_config options.
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dS(sÏRegister the oslo_config options that are needed for a plugin.

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    are specific to a plugin are loaded just before they are read.

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     - auth_type: the name of the auth plugin that will be used for
         authentication.
     - auth_section: the group from which further auth plugin options should be
         taken. If section is not provided then the auth plugin options will be
         taken from the same group as provided in the parameters.

    :param conf: config object to register with.
    :type conf: oslo_config.cfg.ConfigOpts
    :param string group: The ini group to register options in.
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S(s©Load a plugin from an oslo_config CONF object.

    Each plugin will register their own required options and so there is no
    standard list and the plugin should be consulted.

    The base options should have been registered with register_conf_options
    before this function is called.

    :param conf: A conf object.
    :type conf: oslo_config.cfg.ConfigOpts
    :param str group: The group name that options should be read from.

    :returns: An authentication Plugin or None if a name is not provided
    :rtype: :class:`keystoneauth1.plugin.BaseAuthPlugin`

    :raises keystoneauth1.exceptions.auth_plugins.NoMatchingPlugin:
        if a plugin cannot be created.
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