Move FakeSettingsProvider to a common location.

Test: runtest frameworks-util -c com.android.internal.util.test.FakeSettingsProviderTest
Test: runtest frameworks-services -c com.android.server.ConnectivityServiceTest
Test: runtest frameworks-services -c com.android.server.retaildemo.PreloadAppsInstallerTest
Test: runtest frameworks-services -c com.android.server.retaildemo.RetailDemoModeServiceTest
Bug: 31479480
Change-Id: I82a1a1a7219cf1385092b84d85eddf9dda90c685
7 files changed