am b87e0e1d: (-s ours) Merge commit \'27bb6f5f\' into manualmerge

Merge commit 'b87e0e1d17299dcd1cdbcfbb80d680b5db8a8cd2'

* commit 'b87e0e1d17299dcd1cdbcfbb80d680b5db8a8cd2':
  add signing checker script to releasetools