ServiceWifiResources: Generate AOSP keys and sign APK

Generate keys for the ServiceWifiResources APK and
sign the APK using those keys.

Note that these keys are only used to sign locally-built APKs
during development. They are not release keys.

Bug: 149589553
Test: compiles
Change-Id: Iab7f97a7866cb56286fc3bd362846a226c3fd17e
4 files changed