Allow UpdateAttempterAndroid to override otacerts path am: 1304fe7c95 am: 085f417ba5 am: 7cfa676003

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1847797

Change-Id: Idef4101a9f15aec66abac78e8dfba85644355603