header inconsistencies about minio-go

[harshavardhana]

minio-go sends Accept-Encoding: gzip

        // DisableCompression, if true, prevents the Transport from
        // requesting compression with an "Accept-Encoding: gzip"
        // request header when the Request contains no existing
        // Accept-Encoding value. If the Transport requests gzip on
        // its own and gets a gzipped response, it's transparently
        // decoded in the Response.Body. However, if the user
        // explicitly requested gzip it is not automatically
        // uncompressed.
        DisableCompression bool

Looks like a feature and we don't need to enable it.

[harshavardhana]

golang/go#13942 , https://go-review.googlesource.com/#/c/18624/ - here is the fix for other issues.