add --no-cache-dir inside s2i wrappers

[MuhammadAgf]

What this PR does / why we need it:
add --no-cache-dir to remove pip cache

Which issue(s) this PR fixes:

Fixes #2581

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[seldondev]

Hi @m46f. Thanks for your PR.

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[MuhammadAgf]

/assign @axsaucedo

[axsaucedo]

Great, thanks @m46f
/ok-to-test
/test integration

[axsaucedo]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[seldondev]

Tue Dec 1 18:18:30 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-2725/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2725 --build=1

[seldondev]

Tue Dec 1 18:18:36 UTC 2020
The logs for [integration] [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-2725/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2725 --build=2

[seldondev]

Tue Dec 1 18:18:40 UTC 2020
The logs for [lint] [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-2725/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2725 --build=3

[seldondev]

Tue Dec 1 20:11:53 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-2725/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2725 --build=5

[seldondev]

Tue Dec 1 20:12:07 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-2725/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2725 --build=4