[Linaro-validation] staging server update was broke

I was just doing a manual update of staging and see it got broken because the dashboard code now requires a newer version of linaro-dashboard-bundle. I doubt we've packaged that new version and deployed it, so to address it for now I created a local branch for that module as well.

This is more of a note that we'll need to remember to make appropriate updates (lava-manifests ...) when we do our next roll-out of dashboard changes.