Fix lint error in devshell credentials
Fix lint error in devshell credentials

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