metrics_atoms_protoc_plugin: Fix pylint errors am: cdee6e0a4e Original change: https://android-review.googlesource.com/c/trusty/host/common/+/2757187 Change-Id: I28e2b799d26d406b90ac94ab936bedec5ff872f8 Signed-off-by: Automerger Merge Worker <[email protected]>