Python38

[RafalSkolasinski]

What this PR does / why we need it:
This adds Python 3.8 s2i wrapper.

Which issue(s) this PR fixes:

Closes #1230

Special notes for your reviewer:
Simplified build process -> all logic is now is now in build_all.sh and push_all.sh images.

Does this PR introduce a user-facing change?:

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test release

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

/test this

[seldondev]

@RafalSkolasinski: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
release-build-push	d353bb3	link	/test release

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[RafalSkolasinski]

/test notebooks

[axsaucedo]

Nice one - looks good
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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