Actually check the results of build tests. (#137)
Actually check the results of build tests. (#137)

* Actually check the results of build tests.

* Really check the result of each test

Bonuses:
* fix detection of test timeout
* use a unique cluster name so it won't conflict with elafros/elafros E2E tests on the same GCP project
* clearly log when all tests passed

* Use yaml output as a fallback for dumping tests status

knative/build,knative/build