build: Add names to Fresnel scenarios

build: Add names to Fresnel scenarios

Per T216854, it's now supported to give the scenarios a name.
This way, the Jenkins build will have headings like "scenario View a page"
instead of "scenario 0", which is difficult to look up or
understand without the config file side-by-side.

Change-Id: If9884c38eef8b05637a8045c4beb3f2bbf8f5de5