Add support for loading and configuring LightStep as the opentracing backend

[hjkatz]

Integrate the lightstep backend for opentracing (see: https://github.com/opentracing-contrib/nginx-opentracing and https://github.com/lightstep/lightstep-tracer-cpp).

Example PR: #1808

No

Not to my knowledge

/kind feature

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/lifecycle stale

[hjkatz]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

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/lifecycle rotten

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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