KMP AFFINITY benchmark and docs for production optimization

[ukclivecox]

What this PR does / why we need it:

• Adds KMP_AFFINITY notebook
• Adds documentation on production optimization

Which issue(s) this PR fixes:

Fixes #931

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[ukclivecox]

/test integration

[axsaucedo]

/approve

[axsaucedo]

/hold

[axsaucedo]

I had approved but just realised something that has happeend to me before (which is a bit annoying) is failing in the docs test, namely:

/__w/seldon-core/seldon-core/doc/source/examples/notebooks.rst:179: WARNING: toctree contains reference to nonexisting document 'examples/python_kmp_affinity'

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [axsaucedo]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment