Use import-verifier to keep us from breaking build-cross in pkg/network

Author: danwinship

hack/import-restrictions.json

@@ -188,6 +188,19 @@
     ]
   },
 
+  {
+    "checkedPackages": [
+      "github.com/openshift/origin/pkg/network/master",
+      "github.com/openshift/origin/pkg/network/common"
+    ],
+    "forbiddenImportPackageRoots": [
+      "vendor/github.com/vishvananda/netlink"
+    ],
+    "allowedImportPackageRoots": [
+      ""
+    ]
+  },
+
   {
     "checkedPackages": [
       "github.com/openshift/origin/pkg/network/apis/network",