Add abnormal app page for battery settings

1. Add abnormal app page
2. Add strings for abnormal app page
3. Change AnomalyPreferenceController to open abnormal app page,
when there are more than one anomaly.
4. Add AnomalyPreference, who stores a reference of anomaly.

Also rename AnomalyPreferenceController to
AnomalySummaryPreferenceController because this controller is not
used to handle AnomalyPreference.

Following cls will add summary and icon for each abnormal app.

Bug: 37681665
Test: RunSettingsRoboTests
Change-Id: I4266f906476ff8daccd962572c8cfa99f948080a