This PR support to set s3 sign as v2. Resolves #725
Now user could set a new flag --s3.disable_v4_sign=true when there auth_method is secret_key, which will lead using minio/pkg/credentials.NewStaticV2 as the initialization of s3 credential. This can support some situation when s3 do not support v4 sign well.
Sorry it took me so long to get back to this. I squashed your commits, then made a small change to the values (eg v2 instead of s3v2), and landed these changes on the master branch.
This PR support to set s3 sign as v2. Resolves #725 Now user could set a new flag --s3.disable_v4_sign=true when there auth_method is secret_key, which will lead using minio/pkg/credentials.NewStaticV2 as the initialization of s3 credential. This can support some situation when s3 do not support v4 sign well.