Now that we're using the general templates, we can slim down
the role test definitions. We can also remove tests which are
not being watched, or which are fundamentally broken. With
this we can also remove unused scripts/plays.
We do the following:
1. We remove the 'upgrade' job, given that it's been broken
all cycle due to the way the job executes and we need to
regroup to figure out another way to do it. The associated
scripts are also removed.
2. We consolidate test-vars.yml and the overrides into a single
file to conform to the standard in other roles and ensure
that the overrides are only set in one place.
Change-Id: I2dcb1576a75c4d09c6d99e1369775301e99df770
9290ccc383