* Add mechanism for plugin to normalize attributes
This introduces a new normalization call to the plugin RPC service. If
implemented, the plugin will be given the attributes prior to saving
them in a create/update call, and can perform any normalization needed,
e.g. ensuring that a parameter passed in is represented in a canonical
way. As an example, the CLI allows a user of the AWS plugin to pass in a
string, but canonically it is a string slice, and should be returned
that way as well. Not by chance, this is the exact behavior of the
testing implementation of this function.
This does not update any individual plugin, but rather sets the
controller-side logic up for plugins to support this functionality.
Jeff Mitchell
7364d84835