Upgrade alibi-detect component to use alibi-detect 0.4.2

[RafalSkolasinski]

What this PR does / why we need it:

Upgrades alibi-detect server to use alibi-detect=0.4.2.

This is separate from #2404 to only include alibi-detect server changes.

This also splits image build process to independently handle alibi-explain and alibi-detect servers.

Which issue(s) this PR fixes:

Closes #2403

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

updates alibi-detect to version 0.4.2

[RafalSkolasinski]

/test integration

[seldondev]

Mon Sep 14 10:44:21 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-2431/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=2

[seldondev]

Mon Sep 14 10:44:34 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-2431/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=1

[seldondev]

Mon Sep 14 10:46:49 UTC 2020
The logs for [integration] [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-2431/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=3

[axsaucedo]

You should change this to ALIBI_EXPLAIN_MODIFIED and same below so they are separate (and then add them to the values at the bottom)

[RafalSkolasinski]

done

[seldondev]

Mon Sep 14 17:48:24 UTC 2020
The logs for [pr-build] [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-2431/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=4

[seldondev]

Mon Sep 14 17:48:24 UTC 2020
The logs for [lint] [5] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2431/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=5

[axsaucedo]

/approve

[axsaucedo]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[seldondev]

Tue Sep 15 08:58:45 UTC 2020
The logs for [lint] [7] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2431/7.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=7

[seldondev]

Tue Sep 15 08:58:47 UTC 2020
The logs for [pr-build] [6] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2431/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2431 --build=6