* ui: Add URLs to tabs to we can assert them
* Add dcs to the service show page, temporarily
There is an ongoing PR which removes the need to do this by adding a dcs
property to the navigation, hence temporary
* Add a step to assert on whether text _contains_ rather than exact match
* Test whether the URL of the instance tab changes when the user switches dcs using the main navigation menu
* Recompute href-to's on URL change, just like is-href
John Cowen