Added annotation for upstream-vhost

[Stono]

Addresses the following issue: #1950

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[k8s-reviewable]

This change is 

[Stono]

I've signed the CNCF

[aledbf]

/approve

[aledbf]

@Stono thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, Stono

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[coveralls]

Coverage remained the same at 39.659% when pulling 9288fb9 on Stono:master into 2bd9087 on kubernetes:master.