deis pull should be more informative in error cases

[Cryptophobia]

From @rimusz on November 14, 2016 15:35

I was deploying the go app, which was missing set env var and deis pull just gave such strange
error:

Creating build... Error: Post https://deis.staging.clearbit.io/v2/apps/logo/builds/: EOF

deis logs did not show that in more details too. I only was able to get more detailed app log via kubectl log

The same stands for release with curl via API, very informative error message:

curl: (52) Empty reply from server

Copied from original issue: deis/controller#1139

[Cryptophobia]

From @bacongobbler on November 14, 2016 15:50

An empty reply from the server usually means the load balancer closed the connection. We can make the cli handle this error and attempt to provide help but otherwise the error itself is not something we can control.

[Cryptophobia]

From @rimusz on November 14, 2016 16:0

that would be better than nothing, I might switch to using deis cli in CD pipelines then