fix push of conda base image

[RafalSkolasinski]

What this PR does / why we need it:

• fixes push of conda base image: seldonio/conda-ubi8
• makes sure that specified version of conda is used in derived images
• remove Dockerfile.redhat as at this point it is the same as Dockerfile.local

Which issue(s) this PR fixes:

Closes #3405
Closes #3115

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[RafalSkolasinski]

/test release

[seldondev]

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[RafalSkolasinski]

Licence lint is fixed in #3404

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

Notebook and integration tests have already passed.
Just rebased onto master to include lint fixes.
Triggering tests again for completness.

[RafalSkolasinski]

/test integration

[RafalSkolasinski]

/test notebooks

[RafalSkolasinski]

Failure on TestNotebooks.test_server_examples that didn't happen before.
Triggering again

/test notebooks

[seldondev]

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

Test name	Commit	Details	Rerun command
release-build-push	05c29ef	link	/test release
notebooks	ab74a69	link	/test notebooks

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