Add system/extras/verity/build_verity_metadata.py  to otatools am: e718501021
am: 5d77e7e0c1

* commit '5d77e7e0c1425c8d1ed60dd5425267ce79ef4648':
  Add system/extras/verity/build_verity_metadata.py  to otatools

Change-Id: I6a242bbdf47b588064c94b90f47ffdd5dabef1cc