Parameterize mc image and fix access_key/secret_key

[omerfsen]

If we don't pass this --api S3v4 we are getting

The request signature we calculated does not match the signature you provided. Check your key and signing method

error

minio/minio#7936

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

Hi @omerfsen. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[axsaucedo]

THank you @omerfsen - looks good
/ok-to-test
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[seldondev]

Fri Nov 6 14:57:39 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-2619/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2619 --build=1

[seldondev]

Fri Nov 6 14:57:46 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-2619/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2619 --build=2