Update seldon-single-model

[ukclivecox]

What this PR does / why we need it:

• Add further features for deploying prepacked servers from a helm chart
• Allows MLFlow customizations

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

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[seldondev]

Mon Sep 14 16:04:11 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-2435/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2435 --build=1

[seldondev]

Mon Sep 14 16:04:12 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-2435/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2435 --build=2

[axsaucedo]

Interesting, maybe for the parameters we could pass a list of params, so it can provide more flexibility on the parameters that are provided