Improve consistency in go_stateify file generation
Improve consistency in go_stateify file generation

This also fixes the go_vet warning:
error: Fprintln call ends with newline (vet)
PiperOrigin-RevId: 195738471
Change-Id: Ic7a9df40eec1457ef03e6ee70872c497a676b53c

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor