Add shared jarjar rule for tethering tests

Also jarjar com.android.net.module.util* to
com.android.networkstack.tethering.util*.

Bug: 171670016
Test: atest TetheringCoverageTests
Change-Id: I3bde9ad3c41adf36da99bd944303d88ce992201c
diff --git a/Tethering/tests/Android.bp b/Tethering/tests/Android.bp
new file mode 100644
index 0000000..cb0a20b
--- /dev/null
+++ b/Tethering/tests/Android.bp
@@ -0,0 +1,23 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+filegroup {
+    name: "TetheringTestsJarJarRules",
+    srcs: ["jarjar-rules.txt"],
+    visibility: [
+        "//frameworks/base/packages/Tethering/tests:__subpackages__",
+    ]
+}