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Determine which ntp client is to be used, consulting the distro
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the specified package is already installed.
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list.
@param pools: A list of strings specifying ntp pools. Defaults to empty
list.
@param allow: A list of strings specifying a network/CIDR. Defaults to
empty list.
@param peers: A list nodes that should peer with each other. Defaults to
empty list.
@param path: A string to specify where to write the rendered template.
@param template_fn: A string to specify the template source file.
@param template: A string specifying the contents of the template. This
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@raises: ValueError when template_fn is None and template is None.
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