Make it possible to configure TLS client options via new style format

[michaelklishin]

While it is possible to configure client TLS options via the ssl app, it is very obscure to non-Erlang users.

A standard set of TLS options should be exposed via a common set of Cuttlefish options, ideally in a way that doesn't interfere with other plugins, libraries or tools (in Cuttlefish only one key is allowed for one target key).

See rabbitmq/rabbitmq-peer-discovery-consul#14 for background.

[lukebakken]

(in Cuttlefish only one key is allowed for one target key)

You can get around that with transforms! See this schema.

[lukebakken]

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