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: 77861812
Test: cts-tradefed run singleCommand cts-dev -m CtsHostsideNetworkTests -t \
      com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testDataSaverMode_disabled

Change-Id: Iaa9f4fabe83430fa42b6f67c1025db41a5e1d938
Merged-In: Iaa9f4fabe83430fa42b6f67c1025db41a5e1d938
4 files changed