Add zipkin-to-stackdriver yaml to addons

[douglas-reid]

This PR adds deployment/service yaml to install/kubernetes/addons.

Tested with an openzipkin cli that generates zipkin traces and sends them to my (port-forwarded) instance of this deployment.

Release note:

NONE

[ZackButcher]

/lgtm

[douglas-reid]

this PR passes on my local cluster and on the IBM cluster and should have no impact on anything other than adding an option for running an add-on.

i'm going to merge unless there is any objection.

[istio-testing]

@douglas-reid: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
prow/e2e-suite-rbac-auth.sh	3eec6bf	link	/test e2e-suite-rbac-auth
prow/e2e-suite-rbac-no_auth.sh	3eec6bf	link	/test e2e-suite-rbac-no_auth
prow/e2e-suite-no_rbac-no_auth.sh	3eec6bf	link	/test e2e-suite-no_rbac-no_auth
prow/e2e-suite-no_rbac-auth.sh	3eec6bf	link	/test e2e-suite-no_rbac-auth

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[andraxylia]

/lgtm

[istio-merge-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ZackButcher, andraxylia

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[douglas-reid]

thanks! this was the last (non-Mixer) piece in the stackdriver mvp.