Use string for Signatures protobuf.
To avoid conversion between brillo::Blob and string. Also use SerializeToString() instead of AppendToString(). Test: update_engine_unittests Change-Id: I0ad0fb5f45223f9f51f940de727660a9e62052bb
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To avoid conversion between brillo::Blob and string. Also use SerializeToString() instead of AppendToString(). Test: update_engine_unittests Change-Id: I0ad0fb5f45223f9f51f940de727660a9e62052bb
mentioned in commit 0730ba30
mentioned in commit 362f44fc
mentioned in commit 38ab8025