Partially fixes#103
This PR removes instances of "free for all" collation in the `glutton`,
`shell`, and `seedling` runtimes and replaces them with Aura instances.
Aura is configured without a session manager, so the initial authority
set cannot be changed later on.
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Signed-off-by: georgepisaltu <george.pisaltu@parity.io>
georgepisaltu