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

See go/jetpack-test-android-migration

This is the internal version of aosp/915793

Exempt-From-Owner-Approval: already reviewed in aosp
Test: m -j CtsNetTestCases
Change-Id: If102677e4cdc4361b5d93283c4d6140dc477a94a
diff --git a/tests/cts/net/AndroidManifest.xml b/tests/cts/net/AndroidManifest.xml
index 2a57c10..630de7e 100644
--- a/tests/cts/net/AndroidManifest.xml
+++ b/tests/cts/net/AndroidManifest.xml
@@ -43,7 +43,7 @@
         </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"