Add system/extras/verity/build_verity_metadata.py  to otatools am: e718501021 am: 5d77e7e0c1 am: 9f527d5222 am: b4e6eb0e56
am: 86b9acbb96

* commit '86b9acbb96c7ab0448e907793908db51db3008ca':
  Add system/extras/verity/build_verity_metadata.py  to otatools

Change-Id: I1aaf05b27d5ec56fb77597e77225592b038db3f9