test/extended/operators/operators: Don't worry about Progressing ClusterOperator
test/extended/operators/operators: Don't worry about Progressing ClusterOperator

We've been failing this test on Progressing=True since 6300a87622
(e2e: Test that all operators are stable, 2019-02-15, #22058).  But
the installer only cares about ClusterVersion Available=True [1],
which means some operators who have leveled (as far as the
cluster-version operator is concerned) may still have Progressing=True
when the installer declares success.  We aren't too concerned about
that as long as operators are available and not degraded, so stop
worrying about it in this test.  This avoids failures like [2]:

  [sig-arch][Early] Managed cluster should start all core operators [Suite:openshift/conformance/parallel]

  fail [github.com/openshift/origin/test/extended/operators/operators.go:159]: May  8 13:27:58.992: Some cluster operators never became ready: kube-apiserver (Progressing=True NodeInstaller: NodeInstallerProgressing: 1 nodes are at revision 5; 2 nodes are at revision 7)

although such failures rarely killed the job, because the cluster was
happy enough by the time the "start all core operators" test was rerun
to detect "flakes" at the end of the suite.

[1]: https://github.com/openshift/installer/blob/aecb9201459e3e92f12344e78aaaf03b6550fde7/cmd/openshift-install/create.go#L382-L384
[2]: https://deck-ci.apps.ci.l2s4.p1.openshiftapps.com/view/gcs/origin-ci-test/logs/release-openshift-ocp-installer-e2e-gcp-4.5/1040

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