Migrate cts/tests/tests/net to androidx.test

See go/jetpack-test-android-migration

Test: m -j CtsNetTestCases
Change-Id: I4a76e9b9410f94e297bca4287f450fe3b72fb409
Merged-In: If102677e4cdc4361b5d93283c4d6140dc477a94a
diff --git a/tests/cts/net/AndroidManifest.xml b/tests/cts/net/AndroidManifest.xml
index 0bfb650..b261b39 100644
--- a/tests/cts/net/AndroidManifest.xml
+++ b/tests/cts/net/AndroidManifest.xml
@@ -42,7 +42,7 @@
         </receiver>
     </application>
 
-    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
                      android:targetPackage="android.net.cts"
                      android:label="CTS tests of android.net">
         <meta-data android:name="listener"