Fix etcd upgrade sanity

[michaelgugino]

This builds off of #6784

Fix etcd-upgrade sanity checks

This commit ensures that only oo_etcd_to_config and
oo_masters_to_config are checked during sanity_checks.

This will prevent hosts that have not had facts gathered
(such as nodes) will not be processed for correct inventory
and runtime facts.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1536317

[sdodson]

/lgtm

[openshift-merge-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/gcp	13614e3	link	/test gcp
ci/openshift-jenkins/logging	13614e3	link	/test logging
ci/openshift-jenkins/extended_conformance_install_crio	13614e3	link	/test crio

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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