Add error handler for R

[johnny-butter]

What this PR does / why we need it:
raise an error in R code, can not get the message we create

response now:

expect response:

so add an error handler to catch seldon_microservice_error which is used to create a custom error

usage:

source("seldon_microservice_error.R")

predict.model_f <- function() {
  seldon_microservice_error("param X wrong", 400)
}

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Added custom error for R

[seldondev]

Hi @johnny-butter. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ukclivecox]

/ok-to-test

[ukclivecox]

Thanks for this!

[ukclivecox]

/approve

[seldondev]

Fri Jul 17 12:23:36 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-2153/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2153 --build=1

[seldondev]

Fri Jul 17 12:23:39 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-2153/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2153 --build=2

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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[seldondev]

Fri Jul 17 14:58:31 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-2153/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2153 --build=3

[seldondev]

Fri Jul 17 14:58:47 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-2153/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2153 --build=4

[johnny-butter]

@cliveseldon I fixed a typo that I didn't notice before