Change base fragment to InstrumentedFragment

- Modify PrivateVolumeForget, PrivateVolumeFormat, PrivateVolumeUnmount
- Add ShadowStorageManager
- Add test cases

Test: manual
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo

Change-Id: I6883dd12cec00abbc3099bf31d285e6fe455eba6

tests/robotests/assets/grandfather_not_implementing_indexable

@@ -1,5 +1,4 @@
 com.android.settings.accessibility.ToggleScreenMagnificationPreferenceFragment
-com.android.settings.deviceinfo.PrivateVolumeForget
 com.android.settings.inputmethod.SpellCheckersSettings
 com.android.settings.fuelgauge.InactiveApps
 com.android.settings.accessibility.CaptionPropertiesFragment
@@ -43,7 +42,6 @@ com.android.settings.accessibility.ToggleAccessibilityServicePreferenceFragment
 com.android.settings.print.PrintServiceSettingsFragment
 com.android.settings.deviceinfo.PrivateVolumeSettings
 com.android.settings.users.AppRestrictionsFragment
-com.android.settings.deviceinfo.PrivateVolumeUnmount
 com.android.settings.notification.ZenAccessSettings
 com.android.settings.accessibility.ToggleFontSizePreferenceFragment
 com.android.settings.applications.PremiumSmsAccess