Renames / tidy ups

Various non-functional tidy ups:
1) Rename StubbedTimeZoneDetectorStrategy to
FakeTimeZoneDetectorStrategy since it contains some fake behavior.
2) Switch to the android.util.IndentingPrintWriter everywhere.
3) Clarify / rename constants in tests to better document their meaning.
4) Rename Dumpable.Dumpee to Dumpable.Container because Dumpee is a bad
/ misleading name.

Test: Treehugger / atest of touched test files
Bug: 149014708
Bug: 159888952
Change-Id: Ied3d5b8030ccaab6af2f5d47ef643820efa71c1d