Make Devfile the default deployment mechanism for odo

[cdrage]

What type of PR is this?

Uncomment only one /kind line, and delete the rest.
For example, > /kind bug would simply become: /kind bug

/kind feature

What does does this PR do / why we need it:

Makes Devfile the default deployment mechanism, removing S2I in favour
of Devfile deployment.

Which issue(s) this PR fixes:

Closes #3550

How to test changes / Special notes to the reviewer:

Run:

odo preference set experimental false
odo create --starter nodejs
odo push

[openshift-ci-robot]

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[openshift-ci-robot]

@cdrage: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/v4.5-integration-e2e	b6b09c3	link	/test v4.5-integration-e2e

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[openshift-ci-robot]

@cdrage: PR needs rebase.

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