ajorgensen opened a new pull request #2856: Add sha256 checksums for all 
http_archives
URL: https://github.com/apache/incubator-heron/pull/2856
 
 
   I have taken the current sha256 checksum for all of the workspace
   archives so we can verify their signature on download. Since some
   of the artifacts are downloaded over http, we want to make sure
   there was no man in the middle attack done to change the resulting
   binary. This also  gives assurance that the code we are downloading
   has not been tampered with in any way either over the wire or at
   the source.
   
   I used the following function:
   ```
   checksum_remote () {
       curl -L -s $1 | sha256sum | cut -d' ' -f1 | tr -d '\n'
   }
   ```
   to get the sha256 signature and then ran `bazel clean && bazel build 
//heron/...` to verify the signatures were correct.
   
   Closes https://github.com/apache/incubator-heron/issues/2854

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