Support for Zenoss

[rvykunta]

Adding stats support in GO

[googlebot]

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[odeke-em]

Hello @rvykunta, thank you for this pull request and welcome to the OpenCensus project!

It is awesome to see Zenoss add support for OpenCensus and I look forward to more PRs that'll be sent documenting how to use it. LGTM.

[odeke-em]

You'll need to sign a CLA @rvykunta, then comment back here when you've signed it.