Include OS in gsutil version -l output and make other gsutil version output more uniform
Include OS in gsutil version -l output and make other gsutil version output more uniform

dimfeld/gsutil,BrandonY/gsutil,dtjackson/gsutil,GoogleCloudPlatform/gsutil,GoogleCloudPlatform/gsutil,fishjord/gsutil,craigcitro/gsutil,chriskuehl/gsutil-debian,mattdr/gsutil,ttiurani/gsutil