Test enable tethering permission and stopAllTethering

1. Test whether start tethering is gated by suitable permission.
2. Test stopAllTethering

Bug: 153613718
Test: atest CtsTetheringTest

Change-Id: I38702886ea355e1aec8eb8ac404fdd46a44582e3
diff --git a/tests/cts/tethering/Android.bp b/tests/cts/tethering/Android.bp
index 63de301..a5930aa 100644
--- a/tests/cts/tethering/Android.bp
+++ b/tests/cts/tethering/Android.bp
@@ -27,6 +27,7 @@
     static_libs: [
         "TetheringIntegrationTestsLib",
         "compatibility-device-util-axt",
+        "net-tests-utils",
         "ctstestrunner-axt",
         "junit",
         "junit-params",