Make rosmsg output deterministic.
Make rosmsg output deterministic.

This improves build caching.

Change-Id: Ib68a70776f142fb1dd4a568195c4bd07d9b10da8
GitOrigin-RevId: c4aa42ed4280edfb0b3ad6f56736f4b4775c25f1

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core