Revert "enable retries for WB => Dropbox uploads"
Revert "enable retries for WB => Dropbox uploads"

This reverts commit 4e23fbf5acebfd577dc4de1a41e61b7717bdeb95.

 * This was a bad fix.  In fact it didn't fix anything.  It would
   retry the request, but since the stream was exhausted it would just
   hang until the client closed the connection.  This meant that the
   upload was still failing, but instead of getting an informative
   message, we got a 500 ClientResponseError.  Weak.

   I don't have a good way to fix this now without keeping a copy of
   the data around for retrying purposes.

felliott/waterbutler,CenterForOpenScience/waterbutler,RCOSDP/waterbutler,rdhyee/waterbutler,TomBaxter/waterbutler