Revert "Continue after failed unit test"

This reverts commit f70752d9e1.

This change caused Travis and Shippable to report success on all test
runs, even if any tests failed or timed out.

hack/test-go.sh

@@ -151,7 +151,7 @@ runTests() {
   if [[ ! ${KUBE_COVER} =~ ^[yY]$ ]]; then
     kube::log::status "Running unit tests without code coverage"
     go test "${goflags[@]:+${goflags[@]}}" \
-      ${KUBE_RACE} ${KUBE_TIMEOUT} "${@+${@/#/${KUBE_GO_PACKAGE}/}}" || true
+      ${KUBE_RACE} ${KUBE_TIMEOUT} "${@+${@/#/${KUBE_GO_PACKAGE}/}}"
     return 0
   fi
 
@@ -173,7 +173,7 @@ runTests() {
           -cover -covermode="${KUBE_COVERMODE}" \
           -coverprofile="${cover_report_dir}/{}/${cover_profile}" \
           "${cover_params[@]+${cover_params[@]}}" \
-          "${KUBE_GO_PACKAGE}/{}" || true
+          "${KUBE_GO_PACKAGE}/{}"
 
   COMBINED_COVER_PROFILE="${cover_report_dir}/combined-coverage.out"
   {