Settings performance testing

1. Enable airplane mode before start testing.
2. Reset airplane mode after testing.
3. Add all_results tag to track results we have.
4. Add result_count tag to track how many results we have.
5. Add shell command result details to log.

Test: atest SettingsPerfTests:LaunchSettingsTest
Change-Id: I24ed167599b660b2aa94b4a3f8ddae1dcf3d04ff