Moving away from goamz to use minio-go instead. (#4193)

minio-go does fully managed way of handling S3 API requests

  - Automatic bucket location management across all s3 regions.
  - Transparently upload large files in multipart if file 64MB
    or larger.
  - Right GetObject() API provides compatibility with
    io.ReadWriteSeeker interface.
  - Various other APIs including bulk deletes, server side object
    copy, bucket policies and bucket notifications.

Fixes #4182

api/user.go

@@ -1238,7 +1238,7 @@ func getProfileImage(c *Context, w http.ResponseWriter, r *http.Request) {
 				return
 			}
 		} else {
-			path := "/users/" + id + "/profile.png"
+			path := "users/" + id + "/profile.png"
 
 			if data, err := ReadFile(path); err != nil {