client: secure streams

Secure Streams is an optional layer on top of lws that separates policy
like endpoint selection and tls cert validation into a device JSON
policy document.

Code that wants to open a client connection just specifies a streamtype name,
and no longer deals with details like the endpoint, the protocol (!) or anything
else other than payloads and optionally generic metadata; the JSON policy
contains all the details for each streamtype.  h1, h2, ws and mqtt client
connections are supported.

Logical secure streams outlive any particular connection and supports "nailed-up"
connectivity regardless of underlying connection stability.

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