unexpected EOF during upload

[nonsense]

We've been getting errors when uploading to Swarm with the swarm-home CD, for example:

➜  ~ swarm --bzzapi https://swarm-public-8-staging.stg.swarm-gateways.net/ --defaultpath ~/tmp/swarm/index.html --recursive up ~/tmp/swarm                                                                     <<<

Fatal: Upload failed: unexpected EOF

The upload succeeds after a few attempts.

We should review the logs and understand why the upload fails.

[nonsense]

Related: https://github.com/ethersphere/swarm-home/commits/master