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Opentracing / zipkin headers support

This implements issue #287

It’s a very slim implementation that fits most use-cases. Incoming headers are copied to the response. If there are no headers set, we’ll generate some and send them back. The X-B3-TraceId will be written to the logs (by default inside of the [%thread] marks).

This implementation makes it possible to correlate logged exceptions (in case this happens) with the corresponding request log, even when the thread handling the message is re-used shortly after.

It handles all headers mentioned in b3-propagation, as well as the uber-trace-id header that is used by Jaeger (see trace-span-identity to get broader support.


/mongo/metrics-gathering-level: metrics gathering for which level? OFF ⇒ no gathering, ROOT ⇒ gathering at root level, DATABASE ⇒ at db level, COLLECTION ⇒ at collection level WARNING: use requests-log-level level 2 only for development purposes, it logs user credentials (Authorization and Auth-Token headers).

Example restheart.yml fragment:

    #  - x-b3-traceid      # vv Zipkin headers, see https://github.com/openzipkin/b3-propagation
    #  - x-b3-spanid
    #  - x-b3-parentspanid
    #  - x-b3-sampled      # ^^
    #  - uber-trace-id     # jaeger header, see https://www.jaegertracing.io/docs/client-libraries/#trace-span-identity
    #  - traceparent       # vv opencensus.io headers, see https://github.com/w3c/distributed-tracing/blob/master/trace_context/HTTP_HEADER_FORMAT.md
    #  - tracestate        # ^^