Drop Legacy openshift-test entry point: release-4.22

[danchild]

Following the migration of openstack-test to the
OTE framework, the entry point is no longer needed.

Changes:

• Remove openshift-tests builder and entry point in
  the Containerfile
• Remove stale openshift-tests references for make tooling
• Update README.md with new instructions on how to manually
  invoke the new OTE binary
• update module and vendored dependencies

NOTE: openshift/release 4.22 release jobs need to drop callers of the legacy openstack-tests binary before this can be merged.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

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[openshift-ci]

@danchild: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/build	d61209f	link	true	/test build
ci/prow/test	d61209f	link	true	/test test
ci/prow/images	d61209f	link	true	/test images

Full PR test history. Your PR dashboard.

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