[automerger skipped] Remove multi_target_preparer class from config template. am: ce9c1cf13e am: 98fe97316e  -s ours am: 540ef97e3d  -s ours am: 2e6a74cc5b  -s ours
am: 2f9125ed7b  -s ours

Change-Id: Idd5c3812bd33df16b4e176335227d72175fbcc0c