Pull service dumps to help debug test failures.

+ Convert tests to use Junit4
+ Add annotations to specify required conditions for the test to run.

Bug: 137859686
Test: atest hostsidetests/net/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Test: atest hostsidetests/net/src/com/android/cts/net/HostsideNetworkCallbackTests.java
Change-Id: I93317c201a0ea06732e29154ab7e140735381f59
diff --git a/tests/cts/hostside/app/Android.bp b/tests/cts/hostside/app/Android.bp
index d66b71b..e988ea4 100644
--- a/tests/cts/hostside/app/Android.bp
+++ b/tests/cts/hostside/app/Android.bp
@@ -20,6 +20,8 @@
     //sdk_version: "current",
     platform_apis: true,
     static_libs: [
+        "androidx.test.rules",
+        "androidx.test.ext.junit",
         "compatibility-device-util-axt",
         "ctstestrunner-axt",
         "ub-uiautomator",