Merge "Revert "releasetools: Allow using futility-host to sign old TF.zip."" into nyc-dev am: b0df1ef7ac am: 983c979c25 am: bd6d03ab18
am: 8e574cb9f7

Change-Id: Ieac80be91cf5cf111eda0ac3d5a50277a4e31cc5