Rclone powered batch

[RafalSkolasinski]

What this PR does / why we need it:

It modifies standard Argo Workflows Batch Example to use rclone for pulling / pushing the inputs / output files for batch processing. This greatly extends compatibility with different cloud storage providers (40+).

Which issue(s) this PR fixes:

Closes #2819

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[seldondev]

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[seldondev]

Fri Jan 15 11:56:45 UTC 2021
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-2842/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=1

[seldondev]

Fri Jan 15 11:56:53 UTC 2021
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-2842/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=2

[omerfsen]

It is great but maybe we can leave this one as-is and use rclone on different example ?

[seldondev]

Fri Jan 15 12:00:22 UTC 2021
The logs for [pr-build] [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-2842/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=3

[seldondev]

Fri Jan 15 12:00:27 UTC 2021
The logs for [lint] [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-2842/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=4

[seldondev]

Fri Jan 15 12:17:07 UTC 2021
The logs for [pr-build] [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-2842/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=5

[seldondev]

Fri Jan 15 12:17:08 UTC 2021
The logs for [lint] [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-2842/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2842 --build=6