Add system/extras/verity/build_verity_metadata.py  to otatools am: e718501021 am: 5d77e7e0c1
am: 9f527d5222

* commit '9f527d52229c973fddd94b926b803a6be68ae440':
  Add system/extras/verity/build_verity_metadata.py  to otatools

Change-Id: Ie7d8b7401ee58ace28a089f97eeb4bc00c43c100