The apply patch test should have a deterministic way to append patch
data. Add debug logs to dump the length and SHA1 of each step to further
track down the flakiness.
Also redirect the debug logging to stdout in case the logcat becomes too
chatty.
Bug: 67849209
Test: Run recovery_component_test
Change-Id: I42bafef2d9dee599719ae57840b3d8c00d243ebd