Enable import-boss check for integration test

Integration tests imported e2e test code and the dependency made two drawbacks:

- Hard to move test/e2e/framework into staging (kubernetes#74352)
- Need to run integration tests always even if PRs are just changing e2e test code

This enables import-boss check for blocking such dependency.

Author: Kenichi Omichi

hack/verify-import-boss.sh

@@ -30,7 +30,13 @@ kube::golang::setup_env
 
 make -C "${KUBE_ROOT}" WHAT=vendor/k8s.io/code-generator/cmd/import-boss
 
-packages=("k8s.io/kubernetes/pkg/..." "k8s.io/kubernetes/cmd/..." "k8s.io/kubernetes/plugin/..." "k8s.io/kubernetes/test/e2e/framework/...")
+packages=(
+  "k8s.io/kubernetes/pkg/..."
+  "k8s.io/kubernetes/cmd/..."
+  "k8s.io/kubernetes/plugin/..."
+  "k8s.io/kubernetes/test/e2e/framework/..."
+  "k8s.io/kubernetes/test/integration/..."
+)
 for d in staging/src/k8s.io/*/; do
   if [ -d "$d" ]; then
     packages+=("./vendor/${d#"staging/src/"}...")

test/integration/.import-restrictions

@@ -0,0 +1,8 @@
+{
+	"Rules": [
+		{
+			"SelectorRegexp": "k8s[.]io/kubernetes/test/e2e",
+			"AllowedPrefixes": []
+		}
+	]
+}