[release-4.4] Bug 1813851: OpenStack: start using image import when possible

[Fedosin]

Now we use legacy image uploading that doesn't support image conversion. It leads to the fact that we upload qcow2 images to Ceph backend, which doesn't support this format:
https://access.redhat.com/solutions/2434691

By using the Image Import mechanism we make sure that all uploaded images will be automatically converted to Raw for Ceph (and only for Ceph) backends.

If the image import mechanism is not available we fallback to the legacy uploading.

cherry-picked from: #3162

[openshift-ci-robot]

@Fedosin: This pull request references Bugzilla bug 1813851, which is invalid:

• expected dependent Bugzilla bug 1806143 to be in one of the following states: VERIFIED, RELEASE_PENDING, CLOSED (ERRATA), but it is ON_QA instead

Comment /bugzilla refresh to re-evaluate validity if changes to the Bugzilla bug are made, or edit the title of this pull request to link to a different bug.

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In response to this:

[release-4.4] Bug 1813851: OpenStack: start using image import when possible

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[openshift-ci-robot]

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[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/e2e-libvirt	bb8ebf9	link	/test e2e-libvirt
ci/prow/e2e-openstack	bb8ebf9	link	/test e2e-openstack
ci/prow/e2e-aws-fips	bb8ebf9	link	/test e2e-aws-fips

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[Fedosin]

/hold