Log SHA256 of secondary dex files during reconcile.

(cherry picked from commit a0023604ddaeef34049f1a245be7c42a66a7d0e8)

Bug: 63927552
Test: Exercised manually. Added unit test for DexManager.

Merged-In: Ic8e9ea4da8eb5c22fbe088a59a406e36bc2eb6fa
Change-Id: Ic8e9ea4da8eb5c22fbe088a59a406e36bc2eb6fa
5 files changed