Update Alibi-Detect wrapper and drift and outlier examples

[ukclivecox]

What this PR does / why we need it:

• Update Alibi detect wrapper
  • Ensures cloud events v1 used
  • Fixes Dockerfile USER
• Update drift and outlier examples for knative 0.18 and istio 1.7

Which issue(s) this PR fixes:

Fixes #2551

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[seldondev]

Wed Nov 11 15:00:48 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
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[seldondev]

Wed Nov 11 15:00:53 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
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jx get build logs SeldonIO/seldon-core/PR-2626 --build=2

[seldondev]

Wed Nov 11 15:03:07 UTC 2020
The logs for [lint] [4] will show after the pipeline context has finished.
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jx get build logs SeldonIO/seldon-core/PR-2626 --build=4

[seldondev]

Wed Nov 11 15:03:56 UTC 2020
The logs for [pr-build] [3] will show after the pipeline context has finished.
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[ryandawsonuk]

I notice this notebook still says "Tested on GKE with Knative 0.13 and Istio 1.3.1". We should change that to 0.18 and 1.7

[ukclivecox]

Done

[seldondev]

Fri Nov 13 08:33:58 UTC 2020
The logs for [pr-build] [7] will show after the pipeline context has finished.
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jx get build logs SeldonIO/seldon-core/PR-2626 --build=7

[seldondev]

Fri Nov 13 08:34:05 UTC 2020
The logs for [lint] [8] will show after the pipeline context has finished.
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[ryandawsonuk]

/lgtm
/approve

[axsaucedo]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo, ryandawsonuk

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[seldondev]

Fri Nov 13 17:20:43 UTC 2020
The logs for [pr-build] [9] will show after the pipeline context has finished.
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jx get build logs SeldonIO/seldon-core/PR-2626 --build=9

[seldondev]

Fri Nov 13 17:20:57 UTC 2020
The logs for [lint] [10] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2626/10.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2626 --build=10