Use a different key for signing networkpolicy test app.

One of the preparation steps for running cts involves loading up the sim
card with the key used to sign CtsCarrierApiTestCases.apk. It
means if the same key is used for signing networkpolicy test app too,
then the app is considered as carrier privileged by the system and can't
be forced into app standby state.

Fixes: 80077890
Test: cts-tradefed run singleCommand cts-dev -m CtsHostsideNetworkTests -t \
      com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testDataSaverMode_disabled

Change-Id: Iaa9f4fabe83430fa42b6f67c1025db41a5e1d938

tests/cts/hostside/app2/Android.mk

@@ -32,4 +32,6 @@ LOCAL_DEX_PREOPT := false
 # Tag this module as a cts test artifact
 LOCAL_COMPATIBILITY_SUITE := cts vts general-tests
 
+LOCAL_CERTIFICATE := cts/hostsidetests/net/certs/cts-net-app
+
 include $(BUILD_CTS_SUPPORT_PACKAGE)

tests/cts/hostside/certs/README

@@ -0,0 +1,2 @@
+# Generated with:
+development/tools/make_key cts-net-app '/CN=cts-net-app'

tests/cts/hostside/certs/cts-net-app.x509.pem

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----