Lock golang version to 1.x
Lock golang version to 1.x

[#156582099](https://www.pivotaltracker.com/story/show/156582099)

Co-authored-by: Danny Berger <8efccf38e9d8f361e1973ad644e1b1e50ad8ecfe@pivotal.io>

pivotal-golang/s3cli,pivotal-golang/s3cli,pivotal-golang/s3cli,pivotal-golang/s3cli