Since Jenkins has hopefully been set up properly to read test failures
from junit*.xml files, only exit with a nonzero status when there are
infrastructure failures. If there are only test failures, the nonzero
exit status will be ignored.
Also, disable Ginkgo's colors to make the Jenkin console logs more
readable.
And actually, make it more better: Go ahead and tear down the cluster
even when tests fail, but (hopefully) relay the test exit status
correctly. This fails if there's a double error (if -down *also*
fails, we'll fail due to errexit), but either way is a build failure,
and this means that the teardown of a test failure build isn't getting
charged to the next run.
* Add a test/e2e/shell.go that slurps up everything in hack/e2e-suite
and runs it as a bash test, borrowing all the code from hack/e2e.go.
* Rip out all the crap in hack/e2e.go that deal with multiple tests
* Move hack/e2e-suite/goe2e.sh to hack/ginkgo-e2e.sh so that it
doesn't get slurped up.
Use the E2E_REPORT_DIR global environment variable to define the
location where the JUnit XML reports should be saved.
Modify the Jenkins e2e.sh script to export that variable pointing to the
top of the Jenkins build tree.
Tested by running `E2E_REPORT_DIR=${PWD}/.. hack/e2e-test.sh` and
confirmed ../junit.xml was generated and looked good.
