Migrate frameworks/base/tests/net/ to androidx.test

Test: atest FrameworksNetTests
Change-Id: Iaa59d606f5e1678cc5aaca9ed37e184fad894e5d
diff --git a/tests/net/AndroidManifest.xml b/tests/net/AndroidManifest.xml
index 6dae3f1..dcacb6d 100644
--- a/tests/net/AndroidManifest.xml
+++ b/tests/net/AndroidManifest.xml
@@ -51,7 +51,7 @@
     </application>
 
     <instrumentation
-        android:name="android.support.test.runner.AndroidJUnitRunner"
+        android:name="androidx.test.runner.AndroidJUnitRunner"
         android:targetPackage="com.android.frameworks.tests.net"
         android:label="Frameworks Networking Tests" />
 </manifest>