Update Timeouts Notebook

[ukclivecox]

What this PR does / why we need it:

• Update timeouts notebook to test on istio and tests REST and gRPC.

Istio actually has no default timeout so no need to add new code.

Which issue(s) this PR fixes:

Fixes #2727

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[review-notebook-app]

Check out this pull request on 

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[seldondev]

Tue Dec 8 14:37:44 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-2753/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2753 --build=2

[seldondev]

Tue Dec 8 14:37:50 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-2753/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2753 --build=1

[axsaucedo]

Nice
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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