Un-revert #4551 which moved the certs.sh e2e test to ginkgo and fix the

e2e auth breakage it caused. The fix is to not set project/zone/kube_master
to the empty string partway through the script, which I should have
realized was a bad idea in the first place.

test/e2e/util.go

@@ -37,6 +37,7 @@ type testContextType struct {
 	host       string
 	repoRoot   string
 	provider   string
+	gceConfig  GCEConfig
 }
 
 var testContext testContextType