Ensure error status codes are surfaced from client failures

[ukclivecox]

Fixes #1574

• Add custom golang error to pass status code back to top level
• Adds status code and content type as passed back by client
• Fixes python test for non 200 use case
• Cleans up test server struct

[seldondev]

Mon Mar 23 07:48:19 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=2

[seldondev]

Mon Mar 23 07:48:25 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=1

[ukclivecox]

/test integration

[seldondev]

Tue Mar 24 14:53:45 UTC 2020
The logs for [pr-build] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/3.log

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jx get build logs SeldonIO/seldon-core/PR-1575 --build=3

[seldondev]

Tue Mar 24 14:53:48 UTC 2020
The logs for [lint] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=4

[seldondev]

Tue Mar 24 14:53:58 UTC 2020
The logs for [integration] [5] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/5.log

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jx get build logs SeldonIO/seldon-core/PR-1575 --build=5

[adriangonz]

Looks good! Are there any docs that we need to update to reflect the change on the status code?

[seldondev]

Tue Mar 24 17:12:49 UTC 2020
The logs for [pr-build] [6] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=6

[seldondev]

Tue Mar 24 17:12:50 UTC 2020
The logs for [lint] [7] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/7.log

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jx get build logs SeldonIO/seldon-core/PR-1575 --build=7

[seldondev]

Tue Mar 24 17:34:15 UTC 2020
The logs for [pr-build] [8] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/8.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=8

[seldondev]

Tue Mar 24 17:34:24 UTC 2020
The logs for [lint] [9] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1575/9.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1575 --build=9

[adriangonz]

/approve

[seldondev]

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